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Each week, HealthDay's Physician's Briefing division rounds up the most important COVID-19 developments in the medical field. See this week's edition below for May 4-May 8.

FDA Slashes Number of Approved Chinese Makers of N95 Masks

FRIDAY, May 8, 2020 (HealthDay News) -- The number of mask makers in China approved to make N95-type masks for U.S. health care workers was slashed from 80 to 14 by the U.S. Food and Drug Administration on Thursday.

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FDA Approves First At-Home Saliva Test for COVID-19

FRIDAY, May 8, 2020 (HealthDay News) -- The first COVID-19 test using saliva samples that patients collect at home has been approved by the U.S. Food and Drug Administration.

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Symptomatic COVID-19 Infection Fatality Rate 1.3 Percent in U.S.

FRIDAY, May 8, 2020 (HealthDay News) -- The overall infection fatality rate among symptomatic COVID-19 cases in the United States is estimated at 1.3 percent, according to a report published online May 7 in Health Affairs.

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Most Jurisdictions Report COVID-19 in Correctional Facilities

FRIDAY, May 8, 2020 (HealthDay News) -- At least one laboratory-confirmed COVID-19 case has been reported in correctional and detention facilities in 86 percent of 54 state and territorial health department jurisdictions, according to research published in the May 6 early-release issue of the U.S. Centers for Disease Control and Prevention Morbidity and Mortality Weekly Report.

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Asthma, COPD Medication Adherence Up During Pandemic

FRIDAY, May 8, 2020 (HealthDay News) -- Medication adherence for asthma and chronic obstructive pulmonary disease has increased during the COVID-19 pandemic, according to a study published online May 3 in the Journal of Allergy and Clinical Immunology: In Practice.

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Deaths of Despair Likely to Increase During Pandemic

FRIDAY, May 8, 2020 (HealthDay News) -- Up to 75,000 more people could die from drug or alcohol misuse and suicide during the COVID-19 pandemic, according to a report released May 8 by the Well Being Trust and the Robert Graham Center for Policy Studies in Family Medicine and Primary Care.

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SARS-CoV-2 Identified in Semen of Men With COVID-19

FRIDAY, May 8, 2020 (HealthDay News) -- Severe acute respiratory syndrome coronavirus 2 is present in the semen of some patients with COVID-19, including recovering patients, according to a study published online May 7 in JAMA Network Open.

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Risk for SARS-CoV-2 Lower for Prostate Cancer Patients on ADT

FRIDAY, May 8, 2020 (HealthDay News) -- Among prostate cancer patients, those receiving androgen-deprivation therapy versus other treatments have a lower risk for severe acute respiratory syndrome coronavirus 2 infection, according to a study published online May 6 in the Annals of Oncology.

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ACE Inhibitor/ARB Use Not Tied to COVID-19 Test Positivity

FRIDAY, May 8, 2020 (HealthDay News) -- Angiotensin-converting enzyme inhibitor and/or angiotensin receptor blocker use is not associated with COVID-19 test positivity, according to a study published online May 5 in JAMA Cardiology.

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Doubt Cast on Notion That New Strain of COVID-19 Is More Infectious

THURSDAY, May 7, 2020 (HealthDay News) -- A new study suggesting that COVID-19 has mutated to become even more infectious should be viewed with skepticism, former U.S. Food and Drug Administration head Scott Gottlieb, M.D., said Wednesday.

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New York State Reports Cases of Pediatric Inflammatory Syndrome Tied to COVID-19

THURSDAY, May 7, 2020 (HealthDay News) -- The New York State Department of Health issued an advisory on May 6 regarding cases of pediatric multisystem inflammatory syndrome potentially associated with COVID-19.

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GI Symptoms Seen in Less Than 10 Percent of COVID-19 Patients

THURSDAY, May 7, 2020 (HealthDay News) -- Gastrointestinal symptoms are seen in less than 10 percent of patients with COVID-19, according to a meta-analysis published online May 4 in Gastroenterology.

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Anticoagulation May Improve Outcomes in COVID-19 Patients

THURSDAY, May 7, 2020 (HealthDay News) -- For patients hospitalized with COVID-19, systematic anticoagulation may be associated with improved outcomes, according to a research letter published online May 6 in the Journal of the American College of Cardiology.

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New Coronavirus Strain More Contagious, Scientists Say

WEDNESDAY, May 6, 2020 (HealthDay News) -- A new, mutated strain of the coronavirus that causes COVID-19 has become dominant and appears to be more contagious than the strain that spread during the early stages of the pandemic, scientists report.

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Human Trials of Experimental COVID-19 Vaccine Begin in U.S.

WEDNESDAY, May 6, 2020 (HealthDay News) -- Human trials on an experimental COVID-19 vaccine began in the United States on Monday, Pfizer and the German pharmaceutical company BioNTech said.

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Health Care Workers at Risk From Mental Burden of COVID-19

WEDNESDAY, May 6, 2020 (HealthDay News) -- Health care workers and younger people have an increased risk for a psychological impact from COVID-19, according to a study published online April 14 in Psychology, Health & Medicine.

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Well-Controlled Blood Glucose May Improve COVID-19 Outcomes

WEDNESDAY, May 6, 2020 (HealthDay News) -- For patients with COVID-19 and type 2 diabetes, well-controlled blood glucose is associated with lower mortality during hospitalization, according to a study published online May 1 in Cell Metabolism.

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Guideline Issued for Nonsevere, Severe COVID-19 Therapy

WEDNESDAY, May 6, 2020 (HealthDay News) -- In an evidence-based guideline developed by an international team of physicians, pharmacists, researchers, and patients, published online April 29 in CMAJ, the journal of the Canadian Medical Association, recommendations are presented for the treatment of COVID-19.

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ACE Inhibitors, ARBs Not Linked to In-Hospital COVID-19 Death

WEDNESDAY, May 6, 2020 (HealthDay News) -- Age and underlying cardiovascular disease are associated with in-hospital mortality in COVID-19, according to a study published online May 1 in the New England Journal of Medicine.

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Guidance Developed for Lung Cancer Screening During COVID-19

WEDNESDAY, May 6, 2020 (HealthDay News) -- In a CHEST expert panel report, published online April 23 in Radiology: Imaging Cancer, recommendations are presented for the management of pulmonary nodules and lung cancer screening during the COVID-19 pandemic.

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Low-Cost, Noninvasive Ventilator Feasible for Breathing Support

WEDNESDAY, May 6, 2020 (HealthDay News) -- A prototype for a low-cost, noninvasive ventilator, built using off-the-shelf materials available via e-commerce, performs similarly to a high-quality commercial device, according to a report published online April 20 in the European Respiratory Journal.

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Michigan Nursing Homes More Prepared for Pandemics Than in 2007

TUESDAY, May 5, 2020 (HealthDay News) -- Michigan nursing homes are better prepared for pandemics now than they were in 2007, according to a study published online April 15 in the Journal of the American Geriatrics Society.

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ACE Inhibitors, ARBs Not Linked to Risk for COVID-19

TUESDAY, May 5, 2020 (HealthDay News) -- Use of angiotensin-converting enzyme inhibitors or angiotensin-receptor blockers and other classes of antihypertensive medications seem not to be associated with COVID-19, according to two studies published online May 1 in the New England Journal of Medicine.

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Race and Income Influence Risk for Severe COVID-19

TUESDAY, May 5, 2020 (HealthDay News) -- Race and income influence the risk for severe illness from COVID-19, according to a study published online April 28 in the American Journal of Preventive Medicine.

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Variation Seen in COVID-19 Tests, Hospitalization, Deaths Across NYC

TUESDAY, May 5, 2020 (HealthDay News) -- There is considerable variation in the rates of COVID-19 testing, hospitalization, and deaths across New York City boroughs, according to a research letter published online April 29 in the Journal of the American Medical Association.

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Out-of-Hospital Cardiac Arrests Increased in Italy in 2020

TUESDAY, May 5, 2020 (HealthDay News) -- The incidence of out-of-hospital cardiac arrest was strongly associated with the cumulative incidence of COVID-19 in 2020 in Lombardy, Italy, according to a research letter published online April 29 in the New England Journal of Medicine.

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PPE With More Coverage Ups Protection, but Harder to Don, Doff

TUESDAY, May 5, 2020 (HealthDay News) -- Covering more of the body leads to better protection for health care workers against contamination, but greater coverage is usually associated with increased difficulty in putting on and removing personal protective equipment, according to a review published online April 15 in the Cochrane Database of Systematic Reviews.

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FDA Goes After Unproven COVID-19 Antibody Tests

MONDAY, May 4, 2020 (HealthDay News) -- The U.S. Food and Drug Administration said Monday it will crack down on the fraudulent COVID-19 antibody tests that have flooded the market.

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One-Third of U.S. Families Struggling to Meet Basic Needs

MONDAY, May 4, 2020 (HealthDay News) -- The COVID-19 pandemic is straining many families' abilities to meet basic needs, according to a study published April 28 by the Urban Institute.

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With Many States Reopening, COVID-19 Testing Levels Still Too Low

MONDAY, May 4, 2020 (HealthDay News) -- A new analysis shows inadequate levels of testing for COVID-19 in 60 percent of states, many of which are actively reopening after weeks of lockdown.

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Hydroxychloroquine in COVID-19 Ups Risk for QTc Prolongation

MONDAY, May 4, 2020 (HealthDay News) -- Patients with COVID-19 who receive hydroxychloroquine have a high risk for corrected QT prolongation, according to a study published online May 1 in JAMA Cardiology.

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Early Awake Proning for COVID-19 Improves Oxygen Saturation

MONDAY, May 4, 2020 (HealthDay News) -- In COVID-19 patients, awake early self-proning in the emergency department yields improved oxygen saturation, according to a study published online April 22 in Academic Emergency Medicine.

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Patients With Cancer Seem More Vulnerable to COVID-19

MONDAY, May 4, 2020 (HealthDay News) -- Patients with cancer seem to be more vulnerable to COVID-19 and have higher risks for severe outcomes, according to a study published online April 28 in Cancer Discovery.

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Posttraumatic Stress Symptoms Seen in China After COVID-19

MONDAY, May 4, 2020 (HealthDay News) -- Nearly one in 10 people in parts of China hit hardest by COVID-19 report posttraumatic stress symptoms, according to a study published in the May issue of Psychiatry Research.

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Recommendations Made for PPE Use by HCPs in COVID-19 Care

MONDAY, May 4, 2020 (HealthDay News) -- In guidelines from the Infectious Diseases Society of America, recommendations are presented for personal protective equipment use by health care providers in caring for suspected or known COVID-19 patients.

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Our latest HD Live! discussion is an overview of IDWeek, the annual meeting of leading infectious disease experts worldwide.

Mabel Jong from our liveblog team speaks with Dr. Inger Damon and Dr. Tom Talbot, IDWeek Chairs, for a summary of the latest data on a range of infectious diseases, including COVID-19.

Watch our in-depth discussion above, and see our past HD Lives and other videos on our YouTube channel.

HD Live! Videos

Our latest HD Live! discussion is an overview of the American Academy of Pediatrics (AAP) national conference and exhibition.

Mabel Jong from our liveblog team speaks with AAP's Dr. Elizabeth Murray on the key takeaways of the event.

Watch our in-depth discussion above, and see our past HD Lives and other videos on our YouTube channel.

Our latest HD Live! discussion is about getting college students back on campus safely and the COVID-19 testing measures that could help.

Mabel Jong from our liveblog team speaks with Professor David Paltiel, MBA, PhD from the Yale School of Public Health and Dr. Natasha Martin, an infectious disease modeler from UC San Diego leading the #ReturnToLearn program.

Watch our in-depth discussion above, and see our past HD Lives and other videos on our YouTube channel.

Each week, HealthDay's Physician's Briefing division rounds up the most important COVID-19 developments in the medical field. See this week's edition below for August 3-August 7.

U.S. Cancels Blanket Warning for International Travel

FRIDAY, Aug. 7, 2020 (HealthDay News) -- On Thursday, the Trump administration canceled its warnings against international travel because of the COVID-19 pandemic, the Associated Press reported.

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300,000 American Deaths Projected by December Without More Face Mask Use

FRIDAY, Aug. 7, 2020 (HealthDay News) -- As the U.S. COVID-19 case count neared 5 million on Thursday, a new model predicted that nearly 300,000 Americans could die of COVID-19 by December if more people do not wear masks or practice better social distancing.

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Telestroke Consultations Down During COVID-19 Pandemic

FRIDAY, Aug. 7, 2020 (HealthDay News) -- The median number of weekly consults seen through a telestroke network decreased during the COVID-19 pandemic, with Black patients significantly less likely to present with strokes, according to a study published online Aug. 5 in Stroke.

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SARS-CoV-2 Antibodies Detected in 13.7 Percent of NYC HCPs

FRIDAY, Aug. 7, 2020 (HealthDay News) -- Among health care providers in the New York City area, 13.7 percent have severe acute respiratory syndrome coronavirus 2 antibodies, a rate similar to adults randomly tested in New York state, according to a research letter published online Aug. 6 in the Journal of the American Medical Association.

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Moderna Charging Much More for COVID-19 Vaccine Than Others

FRIDAY, Aug. 7, 2020 (HealthDay News) -- Moderna is charging $37 a dose for its experimental vaccine, which is far more than what other companies say they plan to charge for their vaccines, CBS News reported Wednesday. Because two doses of the vaccine are needed to immunize people from COVID-19, total costs could be $74 per person.

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COVID-19 Tied to Higher Risk of Large Vessel Occlusion Strokes

FRIDAY, Aug. 7, 2020 (HealthDay News) -- COVID-19 is associated with large vessel occlusion strokes, according to a study published online July 29 in the American Journal of Roentgenology.

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Scientists Call for Broader Use of Faster COVID-19 Tests

THURSDAY, Aug. 6, 2020 (HealthDay News) -- As COVID-19 cases continue to surge across America, scientists on Wednesday called for widespread adoption of simpler, less accurate tests, as long as they are given often and quickly.

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Johnson & Johnson Makes $1 Billion Vaccine Deal

THURSDAY, Aug. 6, 2020 (HealthDay News) -- The U.S. government will pay Johnson & Johnson $1 billion for 100 million doses of its vaccine if it is approved by the U.S. Food and Drug Administration, the Washington Post reported Wednesday.

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Early Use of IL-6 Inhibitors May Improve COVID-19 Outcomes

THURSDAY, Aug. 6, 2020 (HealthDay News) -- For patients with severe COVID-19, administration of an interleukin-6 receptor inhibitor earlier in the disease course is associated with improved outcomes, according to a study published online July 25 in the International Journal of Infectious Diseases.

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ED Visits Decreased in Five States From January Through April 2020

THURSDAY, Aug. 6, 2020 (HealthDay News) -- As the COVID-19 pandemic intensified, there was a decrease in emergency department visits in five states from January through April 2020, according to a study published online Aug. 3 in JAMA Internal Medicine.

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Seven States Join Pact to Speed COVID-19 Testing

WEDNESDAY, Aug. 5, 2020 (HealthDay News) -- As the daily U.S. COVID-19 death toll averaged more than 1,000 for the ninth straight day on Tuesday, governors from seven states banded together to shorten turnaround time for COVID-19 test results.

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Experimental COVID-19 Vaccine Shows Encouraging Results

WEDNESDAY, Aug. 5, 2020 (HealthDay News) -- Maryland-based Novavax said Tuesday that preliminary trials of an experimental COVID-19 vaccine were promising.

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COVID-19 Case Fatality Rate 29 Percent in Multiple Myeloma Patients

WEDNESDAY, Aug. 5, 2020 (HealthDay News) -- For patients with multiple myeloma and COVID-19, the case fatality rate is 29 percent among hospitalized patients, with increased odds of adverse outcomes among racial/ethnic minorities, according to a study published online July 30 in Blood Cancer Discovery.

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Study Looks at Optimal Strategy for Reopening Schools in U.K.

WEDNESDAY, Aug. 5, 2020 (HealthDay News) -- Population-wide testing and effective contact tracing are necessary to prevent an epidemic rebound following school reopening in the United Kingdom; and severe acute respiratory syndrome coronavirus 2 transmission rates were low in an educational setting in Australia, according to two studies published online Aug. 3 in The Lancet Child & Adolescent Health.

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President Says Medicare Should Expand Telehealth Services

TUESDAY, Aug. 4, 2020 (HealthDay News) -- President Donald Trump signed an order on Monday that will broaden the role of telehealth for Medicare patients, the Associated Press reported.

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Trump's Plan Limits Free Nursing Home COVID-19 Tests

TUESDAY, Aug. 4, 2020 (HealthDay News) -- The plan to give every nursing home a fast COVID-19 testing machine has a catch, the Associated Press reported Tuesday. The catch is that under the Trump administration plan, the government will not give kits to check staff and residents more than a couple of times.

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Number of Newly ID'd U.S. Patients With Cancer Dropped During COVID-19

TUESDAY, Aug. 4, 2020 (HealthDay News) -- During the COVID-19 pandemic period, there was a significant decline in newly identified U.S. patients with six common types of cancer, according to a research letter published online Aug. 4 in JAMA Network Open.

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Burnout High Among Nonphysician Frontline Health Care Workers

TUESDAY, Aug. 4, 2020 (HealthDay News) -- More than 40 percent of nurses on the front lines during the pandemic may be experiencing burnout, according to a research letter published online Aug. 4 in JAMA Network Open.

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Risk for Positive COVID-19 Test Up for Health Care Workers

MONDAY, Aug. 3, 2020 (HealthDay News) -- Frontline health care workers have an increased risk for reporting a positive test for COVID-19, according to a study published online July 31 in The Lancet Public Health.

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Obesity Ups Risk for Intubation, Death With COVID-19 in Adults <65

MONDAY, Aug. 3, 2020 (HealthDay News) -- Obesity is associated with an increased risk for intubation or death among hospitalized adults with COVID-19, with the association observed in adults younger than 65 years but not in older adults, according to a study published online July 29 in the Annals of Internal Medicine.

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Risk for Acute Cerebrovascular Events Low in COVID-19 Patients

MONDAY, Aug. 3, 2020 (HealthDay News) -- For hospitalized COVID-19 patients, the risk for acute cerebrovascular events is low, according to a study published online July 20 in Stroke.

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Each week, HealthDay's Physician's Briefing division rounds up the most important COVID-19 developments in the medical field. See this week's edition below for July 27-July 31.

Plenty of COVID-19 Vaccine Coming, Fauci Says

FRIDAY, July 31, 2020 (HealthDay News) -- When a COVID-19 vaccine is approved, there should be plenty of it available, Anthony Fauci, M.D., infectious diseases chief at the U.S. National Institutes of Health, told a House panel Friday, the Associated Press reported.

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U.S. Puts Up Another $2.1 Billion for Potential COVID-19 Vaccine

FRIDAY, July 31, 2020 (HealthDay News) -- The U.S. is buying up another potential COVID-19 vaccine, the Associated Press reported Friday.

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Telemedicine Use Explodes During COVID-19 Pandemic

FRIDAY, July 31, 2020 (HealthDay News) -- The emergence of telemedicine has accelerated during the coronavirus pandemic. HD Live! sat down with Rujuta Saksena, M.D., an oncologist at Overlook Medical Center in Summit, New Jersey, and Ateev Mehrotra, M.D., associate professor of health care policy at Harvard Medical School in Boston, to discuss the future of telemedicine and its impact on health care.

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COVID-19 Testing Needed Every Two Days to Reopen Colleges

FRIDAY, July 31, 2020 (HealthDay News) -- Symptom-based screening alone is not sufficient to contain a COVID-19 outbreak on college campuses, according to a study published online July 31 in JAMA Network Open.

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Pandemic Causing Increased Anxiety Among MS Patients

FRIDAY, July 31, 2020 (HealthDay News) -- The COVID-19 pandemic is having an impact on the psychological health of patients with relapsing-remitting multiple sclerosis, according to a study published online July 21 in Multiple Sclerosis and Related Disorders.

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Bacterial, Fungal Coinfection Uncommon in COVID-19 Patients

FRIDAY, July 31, 2020 (HealthDay News) -- Bacterial and fungal infections are uncommon in hospitalized COVID-19 patients, but coinfection is associated with high mortality and antibiotic use is widespread, according to a study published in the July issue of Infection Control & Hospital Epidemiology.

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Global Epidemiology of COVID-19 Reported for Prepandemic Era

FRIDAY, July 31, 2020 (HealthDay News) -- Many of the first COVID-19 cases reported from affected countries outside of mainland China involved recent travel to affected countries, according to a study published online July 29 in The Lancet Infectious Diseases.

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School Closures Linked to Decreased COVID-19 Incidence, Death

THURSDAY, July 30, 2020 (HealthDay News) -- School closures in the United States were temporally associated with decreased COVID-19 incidence and mortality, according to a study published online July 29 in the Journal of the American Medical Association.

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Young Children Have Higher Amounts of SARS-CoV-2 RNA

THURSDAY, July 30, 2020 (HealthDay News) -- Young children with mild-to-moderate COVID-19 have higher amounts of severe acute respiratory syndrome coronavirus 2 viral RNA in their nasopharynx than older children and adults, according to a research letter published online July 30 in JAMA Pediatrics.

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Remdesivir Shortages Plague Some Hospitals, Pharmacists Say

THURSDAY, July 30, 2020 (HealthDay News) -- One-third of pharmacists say they do not have enough remdesivir to treat all COVID-19 patients who are eligible for it, according to the results of a survey released by the American Society of Health-System Pharmacists.

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Most Gynecologic Cancer Therapy Not Tied to Higher COVID-19 Risk

THURSDAY, July 30, 2020 (HealthDay News) -- For gynecologic oncology patients with COVID-19, the case fatality rate is 14.0 percent, and chemotherapy and recent major surgery do not predict COVID-19 severity or mortality, according to a study published online July 30 in Cancer.

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More Diabetic Foot Amputations Seen During COVID-19 Lockdown

WEDNESDAY, July 29, 2020 (HealthDay News) -- Patients with diabetes admitted to a tertiary care center for diabetic foot ulceration during the COVID-19 lockdown in Italy had a more than threefold risk for amputation versus patients seen in 2019, according to a study published online July 23 in Diabetes Care.

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Cancer-Related Encounters Down Since Start of COVID-19

WEDNESDAY, July 29, 2020 (HealthDay News) -- There has been a decrease in cancer-related encounters and in cancer screening since the start of the COVID-19 pandemic, according to a study published online July 27 in JCO: Clinical Cancer Informatics.

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Latino Communities at Higher Risk for COVID-19

WEDNESDAY, July 29, 2020 (HealthDay News) -- Factors linked to structural racism and social determinants of health are associated with an increased risk for COVID-19 in Latino communities, according to a study published online July 23 in the Annals of Epidemiology.

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Nearly Half of Hispanics, Blacks Scared to Go to Hospital During COVID-19

WEDNESDAY, July 29, 2020 (HealthDay News) -- Hispanics and blacks are most likely to stay home if experiencing medical emergencies, like a heart attack or stroke, to avoid the risk of contracting COVID-19 at the hospital, according to a poll released by the American Heart Association.

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Depression, Anxiety May Be Signs That COVID-19 Is Attacking Brain

WEDNESDAY, July 29, 2020 (HealthDay News) -- Depression and anxiety exhibited in COVID-19 patients may be a sign that the virus impacts the central nervous system, as these symptoms are closely associated with a loss of smell and taste rather than more severe manifestations of the virus, according to a study published online July 2 in The Laryngoscope.

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FDA Warns Again About Dangers of Methanol-Based Hand Sanitizers

TUESDAY, July 28, 2020 (HealthDay News) -- The U.S. Food and Drug Administration is warning consumers not to use alcohol-based hand sanitizers containing methanol, or wood alcohol, which is used in fuel and antifreeze and is toxic if absorbed through the skin or life-threatening if ingested.

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Myocardial Injury Seen in Many Early in Recovery From COVID-19

TUESDAY, July 28, 2020 (HealthDay News) -- Many patients recently recovered from COVID-19 infection have cardiac involvement, according to a study published online July 27 in JAMA Cardiology.

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One-Third of Individuals Stopping PrEP Meds During Pandemic

TUESDAY, July 28, 2020 (HealthDay News) -- According to the results of a survey, presented at this year's International AIDS Conference (AIDS 2020: Virtual), one-third of respondents stopped using preexposure prophylaxis medication during a COVID-19 shelter-in-place order.

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CDC to Address Inequalities in COVID-19 Reporting

MONDAY, July 27, 2020 (HealthDay News) -- The U.S. Centers for Disease Control and Prevention plans to take steps to improve how it collects COVID-19 data for blacks, Hispanics, and Native Americans, the Associated Press reports.

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COVID-19 Vaccine Candidate Now in Final Phase Testing

MONDAY, July 27, 2020 (HealthDay News) -- A vaccine developed by the U.S. National Institutes of Health and Moderna has entered the final phase of testing, the Associated Press reported Monday.

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COVID-19 Can Result in Prolonged Illness Even in Milder Cases

MONDAY, July 27, 2020 (HealthDay News) -- Even among persons with milder outpatient illness, COVID-19 can result in prolonged illness, according to research published in the July 24 early-release issue of the U.S. Centers for Disease Control and Prevention Morbidity and Mortality Weekly Report.

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Perinatal Transmission of COVID-19 Unlikely With Correct Hygiene

MONDAY, July 27, 2020 (HealthDay News) -- If correct hygiene procedures are undertaken, perinatal transmission of COVID-19 is unlikely to occur, according to a study published online July 23 in The Lancet Child & Adolescent Health.

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Large Proportion of COVID-19 Studies Have Low-Level Evidence

MONDAY, July 27, 2020 (HealthDay News) -- A large proportion of studies on COVID-19 have a low level of evidence, according to a research letter published online July 27 in JAMA Internal Medicine.

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Impact on Glucocorticoids in COVID-19 Varies With CRP Levels

MONDAY, July 27, 2020 (HealthDay News) -- The impact of glucocorticoid treatment on patients with COVID-19 varies according to C-reactive protein levels, according to a study published online July 22 in the Journal of Hospital Medicine.

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Using a mix of symptoms, body weight and other factors, the researchers developed a model that predicts which patients will need to be hospitalized and need breathing support.

There May Be 6 Types of COVID-19

TUESDAY, July 28, 2020 (HealthDay News) -- COVID-19 may not be just one disease, but six distinct types, a new British study claims.

Each type differs in severity and in the need for respiratory support during hospitalization, the researchers added.

Cough, fever and loss of smell are the usual symptoms of COVID-19, but the range of symptoms can include headaches, muscle pain, fatigue, diarrhea, confusion, loss of appetite, shortness of breath and more.

Read the full HealthDay story.

Both vaccines require two doses, spaced several weeks apart. Then researchers will have to wait to see whether people get infected or sick with COVID-19.

Final Coronavirus Vaccine Trials Get Underway

TUESDAY, July 28, 2020 (HealthDay News) -- As the U.S. coronavirus case count passed 4.3 million on Monday, companies launched the final phase of testing for two potential COVID-19 vaccines.

In one trial begun on Monday, the first of 30,000 volunteers were either given a vaccine developed by Moderna Inc. and the U.S. National Institutes of Health or a placebo shot, the Washington Post reported.

Pharmaceutical giant Pfizer also announced Monday that it was starting a 30,000-person final phase vaccine trial, to be conducted at 120 sites globally.

Read the full HealthDay story.

These so-called super spreaders aren't very common, but if they are engaged in activities like loud speaking or singing, their viral emissions can increase by 1 to 2 orders of magnitude, the researchers said.

COVID-19 'Super Spreaders' Quickly Fill Room With Virus — But Masks Help

MONDAY, July 27, 2020 (HealthDay News) -- Face masks can help prevent the spread of COVID-19 among folks trapped in a room with an infected "super spreader," a new Swiss study claims.

Most infected people with a typical COVID viral load don't flood the air with coronavirus-infected respiratory droplets, and the risk of catching the virus from them tends to be low, estimates show.

But a severely infected person who's coughing frequently can fill a poorly ventilated room with as many as 7.4 million copies of the coronavirus for every cubic meter of air, according to researchers Michael Riediker and Dai-Hua Tsai, from the Swiss Centre for Occupational and Environmental Health in Winterthur.

Read the full HealthDay story.

A video recording showed that the 3-ply surgical mask was the most effective, but even a single-layer mask reduced the spread of droplets.

More Layers Are Better With Homemade Face Masks

FRIDAY, July 24, 2020 (HealthDay News) -- When it comes to homemade face masks, two or three layers of fabric is best, researchers say.

That's what you need to keep droplets from your nose and mouth from spreading the virus, the Australian scientists found.

Several kinds of material have been suggested for making masks, but there's little or no evidence of how effective they are, the team noted.

Read the full HealthDay story.