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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.

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HD Live! Videos

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.

Watch our latest HD Live! as we take a deep dive into the vaccine rollout across the country.

Mabel Jong from our liveblog team speaks with Dr. Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota and a member of the Biden COVID-19 Advisory Board.

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 deep dive into the latest information on the COVID-19 vaccines, including the rollout process, potential side effects, supply and distribution.

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.

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 back and a look ahead at COVID-19 and its impact on the United States and its healthcare workers.

Mabel Jong from our liveblog team speaks with Dr. David Shulkin, former Secretary of Veterans Affairs, ex-CEO of Beth Israel Medical Center in New York and an accomplished healthcare executive, and Dr. Joel Zivot, anesthesiologist and clinician at Emory University Hospital ICU.

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

Watch our latest HD Live! with Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases (NIAID).

Mabel Jong from our liveblog team speaks with Dr. Anthony Fauci about the latest on COVID-19, including the vaccines, the infection rates and the future.

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

Our latest HD Live! is a conference wrap-up of the American Heart Association Scientific Sessions 2020.

Mabel Jong from our liveblog team speaks with Dr. Donald Lloyd-Jones, American Heart Association President-Elect, for a summary of the highlights of the AHA Scientific Sessions 2020.

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

Our latest HD Live! discussion is on how healthcare in America could be impacted by a Trump or Biden victory.

Mabel Jong from our liveblog team speaks with Marianne Udow-Phillips, director of the Center for Health and Research Transformation at the University of Michigan, and Brian Blase, who served as a healthcare adviser to President Trump from 2017-2019 and is now president and CEO of Blase Policy Strategies.

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