A leading Thai virologist says blood tests should be used to determine the percentage of the population that has been infected with Covid-19. According to a Nation Thailand report, Dr Yong Poovorawan claims that a blood test can even detect Covid-19 in asymptomatic patients. The head of the Center of Excellence in Clinical Virology made the statement in a post on his Facebook page yesterday.
Yong explains that Covid infections behave like a pyramid, with 90% of patients at the bottom – meaning they are asymptomatic or only have mild symptoms. This is especially the case with the now-dominant Omicron variant. However, at the top of the pyramid are the Covid patients seriously affected by the virus. These include the elderly and people with underlying health conditions.
According to Yong, a recent study tested the blood of 80 children between the ages of 5 and 11, who were not in a high-risk group and showed no signs of Covid-19 infection. Tests showed that 5 of the children had been infected but were asymptomatic, having developed natural immunity to the Covid virus spike protein.
Yong says such immunity cannot be replicated by vaccines and that children are part of a segment of the population that remains asymptomatic, which means they must take a blood test to show they have been infected with the virus. This means that blood tests are the only way to accurately determine how many people in the country have been infected with Covid-19 and have developed natural immunity.
However, he adds that such immunity does not last long, dropping to 25% a year after infection. According to the virologist, blood tests can be used in conjunction with a person’s vaccination history to determine immunity levels.
THE SOURCE: Nation Thailand