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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.

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For conventional contact tracing to be effective, test results need to be delivered within a day of a person developing symptoms, according to a new study.

Contact Tracing Useless Unless It's Speedy: Study

THURSDAY, July 16, 2020 (HealthDay News) -- It's the Holy Grail for containing the spread of coronavirus, but contact tracing only works if it is done quickly, researchers report.

The modeling study showed that even if all contacts are successfully traced, a delay of three days or more between the start of symptoms and testing will not reduce transmission of the virus sufficiently to control further spread.

The news couldn't come at a worse time, as surging coronavirus cases are swamping labs across the country and triggering delays in test results.

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An interesting new report shows just how effective face masks can be for stopping the spread of COVID-19.

139 Clients, No COVID Infections: Hair Salon Study Shows Face Masks Work

TUESDAY, July 14, 2020 (HealthDay News) -- While Americans continue to debate whether face masks can stop the spread of coronavirus, a new report offers compelling evidence that the coverings do indeed work.

In May, two hairstylists at a Missouri salon who had COVID-19 but wore face masks cut the hair of 139 masked customers for roughly a week, and did not infect a single client. They also did not infect any of the clients' contacts or any of the other stylists in the salon, researchers report.

The first stylist worked with clients for eight days while symptomatic, while the second stylist did the same for five days, the researchers wrote.

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There are signs of new trouble in regions outside current hotspots, too: Twenty states and Puerto Rico reported a record-high average of new infections over the past week.

New Coronavirus Cases and Deaths Spike Across America

MONDAY, July 13, 2020 (HealthDay News) -- New U.S. coronavirus cases surged across 37 states on Sunday, with worsening hotspots in the South and West also fueling new daily records for COVID-19 deaths.

Florida recorded more than 15,000 new infections on Sunday, breaking the daily record for new cases once held by New York back at the beginning of the pandemic, The New York Times reported. The state also saw single-day records in the counties that include its largest cities -- Miami, Fort Lauderdale, Orlando, Fort Myers, West Palm Beach, Pensacola and Sarasota.

Five states -- Arizona, California, Florida, Mississippi and Texas -- also broke records for average daily COVID-19 fatalities in the past week, the Washington Post reported. That marks a departure from the past weeks, when death rates had remained steady even as case numbers rose.

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In many cities, a combination of factors are fueling the problem: a shortage of key supplies, backlogs at laboratories that perform the tests, and surging infection counts as cases climb in almost 40 states.

U.S. Coronavirus Cases Near 3 Million as Hospitals in Sun Belt Fill Up With Patients

TUESDAY, July 7, 2020 (HealthDay News) -- With the number of coronavirus cases in the United States approaching 3 million on Monday, hospitals across the Sun Belt continued to be flooded with COVID-19 patients.

Arizona reached 89 percent capacity for ICU beds, as Alabama, California, Georgia, North Carolina, South Carolina and Texas also reported unprecedented numbers of hospitalizations, the Washington Post reported.

For the 28th day in a row, the country's rolling seven-day average of daily new cases obliterated previous records, though the number of deaths nationwide has remained relatively stable, the newspaper reported.

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Thirty-six states continue to struggle with alarming spikes in COVID-19 infections, especially Florida, which reported 9,585 new cases on Saturday and 8,530 on Sunday.

Global Coronavirus Cases Pass 10 Million as U.S. Struggles With Surge in Infections

MONDAY, June 29, 2020 (HealthDay News) -- As the worldwide coronavirus case count passed 10 million and the death toll topped 500,000 on Sunday, 36 U.S. states continued to struggle with alarming spikes in COVID-19 infections.

Experts cautioned that Florida could become the next epicenter for infections while Texas has seen record-breaking case counts and hospitalizations, CNN reported. Officials across the country are also warning of an increase in cases among younger people.

Over the weekend, Florida shattered its previous records and reported 9,585 new cases on Saturday and 8,530 on Sunday, The New York Times reported. Six-hour lines formed in Jacksonville as thousands showed up to get drive-through tests. Orange County, home to Orlando, has seen an explosion of coronavirus: nearly 60 percent of all cases there have come in the past two weeks.

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Dr. Anthony Fauci is one of the experts who will appear before the House Energy and Commerce Committee on Tuesday to testify before Congress on the handling of the coronavirus pandemic.

Amid Jumps in COVID-19 Infections, U.S. Health Officials to Testify in Congress

TUESDAY, June 23, 2020 (HealthDay News) -- As 29 U.S. states and territories posted spikes in new COVID-19 cases on Monday, the country's top health officials prepared to testify before Congress on their handling of the coronavirus pandemic.

Dr. Anthony Fauci, the nation's top infectious disease expert, and Dr. Robert Redfield, director of the Centers for Disease Control and Prevention, will appear before the House Energy and Commerce Committee on Tuesday, The New York Times reported. Adm. Brett Giroir, once the administration's testing "czar," and Dr. Stephen Hahn, the commissioner of the Food and Drug Administration, also plan to testify.

In a statement sent to the committee before the hearing, the CDC said that "COVID-19 activity will likely continue for some time," potentially exacerbating the flu season and straining beleaguered hospitals, the Times reported.

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Experts say rising case counts reflect both more testing, as well as the spread of new infections.

Brazil, United States Fuel Biggest One-Day Jump in Coronavirus Cases Worldwide

MONDAY, June 22, 2020 (HealthDay News) -- The World Health Organization recorded the largest single-day worldwide increase in coronavirus cases on Sunday, with Brazil and the United States logging the biggest jumps in infections.

More than 183,000 new cases were reported around the globe in the past 24 hours, with Brazil's daily tally hitting 54,771 and the United States following closely behind with 36,617 new cases, CBS News reported. More than two-thirds of new COVID-19 deaths were reported in the Americas, the network reported.

Experts say rising case counts reflect both more testing, as well as the spread of new infections. In the United States, the resurgence in infections isn't a "second wave," but instead a continuation of the first wave of outbreaks, they noted.

Read the full HealthDay story.