Scientists from Beijing University found out that among people with a confirmed diagnosis of COVID-19 about 40 percent are asymptomatic carriers of coronavirus infection. The study was published in Jama Network Open magazine.
Experts studied the results of 95 scientific papers and came to the conclusion that two of the five infected disease occurs asymptomatic. The review included cross and cohort studies, as well as studies of series of cases. In total aggregate, research covers more than 29 million people.
It is noted that the total percentage of asymptomatic infections among the tested population was 0.25 percent. An analysis of the residents of nursing homes (4.52 percent), air passengers and passengers of cruise liners (2.02 percent), medical workers and patients of general profile hospitals (0.4 percent), as well as pregnant women (2.34 percent) . Among those who have revealed coronavirus infection, 40.5 percent were asymptomatic carriers.
According to scientists, most patients did not appeal for medical help and could not be detected using temperature screening. Almost all of all infection was identified with mass testing in narrow risk groups, as well as when monitoring contacts surrounded by the sick. Researchers suggest that most likely the percentage of asymptomatic carriers of infection is actually much higher.
“The high percentage of asymptomatic infected points to the potential risk of transmitting infection in communities. Screening to asymptomatic infection is necessary, especially in countries and regions in which they have already successfully taken control of the distribution of SARS-COV-2,” researchers believe.
Earlier, the doctor allergist-immunologist Vladimir Bolyibok said, the number of asymptomatic patients with COVID-19 during the last wave of infection in Russia decreased. According to the physician, in Russia there was less asymptomatic carriers of coronavirus due to the speed, with which the “Delta” is attack the human body. Bolibok stressed that more and more Russians are experiencing signs of illness and turn to doctors for help.