Why are some people with coronavirus asymptomatic — and why are they so contagious? New research sheds light on asymptomatic transmission is 'the Achilles’ heel of COVID-19.'
Just how contagious is someone who has contracted COVID-19 — yet displays no symptoms — and what makes them asymptomatic while other people suffer so terribly with the disease?
The study was led by Seungjae Lee, an associate professor at Soonchunhyang University College of Medicine in South Korea, was peer reviewed, and carried out earlier in the pandemic; the researchers analyzed swabs taken from the group between March 6 and March 26. The World Health Organization currently estimates that 16% of people with COVID-19 are asymptomatic and can transmit the coronavirus, while other data show that 40% of coronavirus transmission is due to carriers not displaying symptoms of the illness.
Those ACE2 receptors or “doorways” appear to be more prevalent in older people and those who are obese than younger people. That may go some way in explaining why so many young people have not been as badly affected by the virus as those older than 60, for instance. But a strong immune response to an infection from a virus such as COVID-19 can sometimes cut both ways. Case in point: Doctors and members of the public were spooked by how otherwise strong, healthy people fell victim to the 1918 influenza.
“In fact, the death rate from pneumonia and influenza that year among 25-34-year-olds in the United States was more than 50% higher than that for 65-74-year-olds. A remarkable difference to Covid-19,” Deutsche Bank said. — Monica Gandhi, Deborah Yokoe and Diane Havlir, scientists at the University of California, San Francisco Public-health officials have advised people to keep a distance of six feet from one another.
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