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Half of those infected with coronavirus have no symptoms: why is it bad

According to data from Iceland, the Italian city of Vaud and the cruise ship Diamond Princess, about half of people infected with coronavirus show no symptoms. Writes about it Fox News.

Photo: Shutterstock

Data from these locations are of particular interest to researchers in that half of those infected did not show any symptoms - which is not the case in the United States and most countries.

Experts say this discovery is of particular importance and shows that even more extensive testing may be required to identify all media.

Cruise liners

All 3711 passengers on the Diamond Princess cruise ship were tested. According to the Japanese health agency, also cited by the CDC, 712 people had positive results, of which 331 (46 percent) never had external symptoms.

“Many cases appear to be asymptomatic. This is both good news and bad news, because it means that the lethality of the virus may be lower than originally thought, but also that people may unknowingly spread the virus, ”Patrick T. Dolan, a virologist at the University of California, told Fox News in San Francisco.

On the subject: How to make a protective mask yourself: a simple step-by-step instruction

Experts say the discovery is important and shows that even more testing may be required to identify all media.

It is also expected that the Centers for Disease Control and Prevention (CDC) will soon recommend wearing masks for everyone in the hot spots of the virus, as this can help prevent the spread of the virus among people who do not have symptoms.

Health experts say asymptomatic carriers are a serious problem. The situation requires "the best national broad testing policy to isolate asymptomatic cases," said Ali S. Khan, dean of the College of Public Health at the University of Nebraska Medical Center.

The US started testing late, but is quickly becoming the world leader in the spread of coronavirus.


In Iceland, more than 6% of all residents of the country were tested, which is the largest share in the world. Almost half of these tests were conducted as part of a “screening program,” in which anyone who asks for a test can get it even if they have mild symptoms or are absent.

On the subject: Scientists have identified non-obvious symptoms of coronavirus: a list

“Out of 5502 samples taken as part of the screening program from March 13 to 19, 50 tested positive for SARS-CoV-2. 66% of these people reported symptoms such as coughing and body aches, while the rest of them had no symptoms, ”the Icelandic Health Office said.

People without symptoms can spread the disease, but “we know that the virus is much more likely to spread from person to person if an infected person shows symptoms,” Njalsson said.

The good news is that a high percentage of cases without symptoms means that more people have recovered than the researchers thought. But virologists say that even with this in mind, more than a million people can die if precautions are not taken.

“Observe distancing and other measures, such as wearing a face mask of some sort, perhaps even homemade, when you go shopping for food or drugs,” says Dr. Peter Kolchinsky, author of The Great American Drug Deal: new recipe ". He studied virology and is a managing partner of RA Capital Management, which invests in new drugs.

“We should all try to stay free of infection to reduce the burden on hospitals until we receive effective treatment and vaccines. When we get widespread testing, people can go back to work, ”he said.

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