Extensive randomized testing and follow-up of contacts to provide a more comprehensive picture of who is transmitting the virus and how it has not yet taken place in schools. In July, researchers from the Korean Centers for Disease Control and Prevention published the results of more than 59,000 contacts of 5,706 coronavirus patients in the journal Emerging Infectious Diseases. It was found that children under the age of 10 transmitted the virus much less than children between the ages of 10 and 19, whose transmission rate was the same as in adults. But only 3 percent of patients in this initial group were 19 and younger, and their testing was likely due to symptoms. It is still unclear how asymptomatic children who are difficult to identify can spread the virus; it is also not clear whether there are differences in transmission between 10 and 19 years.
“A lot of the data we get from different sources is chaotic and doesn’t necessarily point in the same direction,” says Nicholas Davies, an epidemiologist at the London School of Hygiene & Tropical Medicine. Together with colleagues, he used a statistical method called Bayesian inference to test several hypotheses about children and Covide. This includes areas where children are infected but do not show symptoms and that children are less prone to infection. Based on epidemiological data from China, Italy, Japan, Singapore, Canada and South Korea, the researchers concluded that both areas were to some extent true. Their findings, published in the Natural Medicine in June, estimate that people under the age of 20 are infected at about half of their age, and will be only 21 percent among those aged 10 to 19 who receive the virus. clinical signs. They could not distinguish more accurately age or say the likelihood that some children would infect others.
None of these studies directly address the impact of school opening on the spread of the Covid program. When researchers from the University of Washington, Department of Global Health and Epidemiology, began compiling a compilation of models from the 15 countries where students returned, they found “very few” scientific publications on the subject and relied primarily on news reports. In almost all countries, schools have found that schools have taken safety measures, including face masks and social distancing. None of the countries (with the exception of Sweden, which left many schools open) continued to class before the infection rate in each country dropped significantly; there is no evidence to suggest the outcome of school opening in areas of the US where the virus is growing rapidly. In Germany, where the infection rate was higher than in other European countries, the return of older students was accompanied by an increase in infections among themselves but not among staff, according to a prepress by researchers from the University of Manchester and Public Health England.
In Israel, students and staff wore masks after schools opened in early May. But a few weeks later, these rules were released. According to Haaretz, the outbreaks began soon after thousands were exposed to infections in schools, causing many of them to close again. There is a “vague cause and effect” between the removal of masks and outbreaks, says lead author Brandon Guthrie, but it is “indirect evidence” that they provide some protection in the classroom. It also reveals how unenforceable schools providing health counseling may be.