The study found that more than 40% of COVID-19 patients are asymptomatic experts: quite a few "latents" are quietly spreading the virus

According to USA Today reported on the 14th, a study published in JAMA Network Open on Tuesday showed that more than 40% of people who tested positive for the new crown never showed any symptoms. Medical experts worry that a considerable number of "latents" are quietly spreading the virus.

Source: The Associated Press

The researchers reportedly looked at 95 studies from January 2020 to February 2021, which were made up of statistics from nearly 30 million people in Asia, Europe, North America, South America and Africa.

More than 60% of confirmed COVID-19 cases are asymptomatic among people under the age of 20 years; nearly 50% in people aged 20 to 39 years; in people aged 40 to 59 years, this is about 32% in people aged 40 to 59 years, and about 33% in people over 60 years of age.

"Overall, the results show that two-thirds of older adults are symptomatic, and about two-thirds of 20- to 30-year-olds are asymptomatic," said Dr. Alan Wells, medical director of upMC Clinical Laboratories and professor of pathology at the University of Pittsburgh School of Medicine. ”

The study also showed that nursing home residents or staff, air or cruise passengers, and pregnant women have the highest number of asymptomatic cases, as they typically undergo frequent testing.

The study data represented only 0.25 percent of the subject population, but health experts say it remains a concern.

Mark Cameron, an infectious disease immunologist at Case Western Reserve University School of Medicine, said: "This doesn't seem like a big statistic. "But when you multiply that by hundreds of millions of people around the world, you know that there are quite a few 'lurkers' who are quietly spreading the virus."

Health experts say there may be more CASEs of COVID-19 today without symptoms due to highly contagious variants such as Delta and Omicron than when the study was conducted. Cameron also said that the more severe the disease, the higher the level of neutralizing antibodies and lasting immunity in the human body, and asymptomatic and mild infection will lead to a weakened immune response, and the possibility of re-infection is high. ”

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