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Past research has suggested that one aspect of what makes COVID-19 so dangerous is that people with no symptoms or who have only mild symptoms are playing a huge role in spreading the virus to others without even realizing it.

HealthDay took a look at research in Iceland that found that up to half of people who tested positive for COVID-19 there didn't display any symptoms.

Read the full story below.

Half of People With COVID-19 Do Not Have Symptoms, Iceland Testing Shows

WEDNESDAY, April 1, 2020 (HealthDay News) -- Up to half of people who test positive for the new coronavirus do not have symptoms, results from Iceland show.

As of March 31, more than 17,900 people in Iceland had been tested for the virus, nearly 5 percent of its population, CNN reported. The National University Hospital tests people who are high-risk or have symptoms, but nearly half the tests have been conducted in the wider population by the biopharmaceutical company deCODE Genetics.

Fewer than 1 percent of the tests conducted by the company were positive for coronavirus, but about 50 percent of people who tested positive had no symptoms, company founder Kári Stefánsson, M.D., told CNN. That supports previous research suggesting that people with no or mild symptoms play a significant role in spreading the coronavirus.

"What it means in my mind, is that because we are screening the general population, we are catching people early in the infection before they start showing symptoms," Stefánsson told CNN.

Read the story on HealthDay.

In our latest HealthDay Now, Mabel Jong spoke with Dr. Lori Pierce, president of the American Society of Clinical Oncology and a cancer radiation specialist at the University of Michigan.

Dr. Pierce shared important takeaways from the recently concluded 2021 ASCO annual meeting and discussed why equity was the chosen theme this year.

Watch the in-depth discussion above, and see our past HealthDay Nows and other videos on our YouTube channel.

HD Live! Videos

Watch our latest HealthDay Now as we cover the latest on the Johnson & Johnson COVID-19 vaccine investigation. An independent advisory panel to the CDC is waiting on additional information before making recommendations on the use of the Johnson & Johnson COVID-19 vaccine after reports about rare blood clots.

Mabel Jong from our liveblog team speaks with Lynn Bahta, a member of the CDC's Advisory Committee on Immunization Practices (ACIP) and a clinical expert for vaccines at the Minnesota Department of Health.

Watch the in-depth discussion above, and see our past HealthDay Nows and other videos on our YouTube channel.

Watch our latest HealthDay Now as we recap the highlights of the American Association for Cancer Research (AACR) Annual Meeting 2021.

Mabel Jong from our liveblog team speaks with Dr. Antoni Ribas, former president of the American Association for Cancer Research and professor of medicine at UCLA, and Anna Plym, PhD, a postdoctoral research fellow at Brigham and Women's Hospital.

Watch the in-depth discussion above, and see our past HealthDay Nows and other videos on our YouTube channel.

Watch our latest HealthDay Now as we dive into the latest details on multisystem inflammatory syndrome in children (MIS-C).

Mabel Jong from our liveblog team speaks with Dr. Mary Beth Son, Program Director of Boston Children's Hospital's Rheumatology Program, and Brian Padla, father of James Padla, who has MIS-C.

Watch the in-depth discussion above, and see our past HealthDay Nows and other videos on our YouTube channel.


Watch our latest HealthDay Now as we debunk myths about the COVID-19 vaccines and talk about what the new CDC guidelines for vaccinated people mean.

Mabel Jong from our liveblog team speaks with Dr. Paul Offit, Director of the Vaccine Education Center and an attending physician in the Division of Infectious Diseases at Children's Hospital of Philadelphia and one of the physicians on the FDA Vaccines and Related Biological Products Advisory Committee, and Dr. Mercedes Carnethon, Vice Chair of Preventive Medicine at the Northwestern Feinberg School of Medicine.

Watch the in-depth discussion above, and see our past HealthDay Nows and other videos on our YouTube channel.

Watch our latest HealthDay Now as we take a look at how living through the COVID-19 pandemic impacts children socially, mentally and emotionally.

One year in, this is their "new normal," but what does that mean for them? From social isolation to remote learning to a loss of structure and normalcy, we discuss how living during the pandemic has both short- and long-term effects on children.

Mabel Jong from our liveblog team speaks with:

  • Dr. Mark Reinecke, Department of Psychiatry & Behavioral Sciences, Northwestern University
  • Tracy Compton, a parent
  • Stephen Guerriero, a teacher
  • Jake Anderson, a student

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

Watch our latest HD Live! as we take a look at the COVID-19 pandemic and the vaccination rollout and how they've impacted people of color.

Mabel Jong from our liveblog team speaks with:

  • Tasha Clark-Amar, CEO, East Baton Rouge Council on Aging
  • Jill Ramirez, Executive Director, Latino HealthCare Forum (Austin)
  • Vickie Mays, PhD, Professor, UCLA Fielding School of Public Health

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

Watch our latest HD Live! as we take a look at the global COVID-19 vaccination rollout and how the United States rollout compares.

Mabel Jong from our liveblog team speaks with Dr. Ran Balicer of Clalit Health Services and Dr. Arnold Monto of University of Michigan School of Public Health.

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

UPDATE 1/26/21: Since our HD Live! interview with CEO Andrei Doroshin, the Philadelphia Health Department has severed its ties with the organization. The nonprofit has changed its status to a for-profit entity.

Watch our latest HD Live! as we take a look at Philly Fighting Covid, a nonprofit organization run by graduate students from Drexel University that aims to help with mass COVID-19 vaccination in Philadelphia.

Mabel Jong from our liveblog team speaks with Andrei Doroshin, founder of Philly Fighting Covid.

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