Kuai Technology reported on August 29 that a study recently released by the Centers for Disease Control and Prevention of the United States showed that after the delta mutant strain of the COVID-19 became the “main force” of the epidemic, the overall effectiveness of the COVID-19 vaccine approved in the United States has been reduced. About one-third. Researchers analyzed the …

Covid-19 virus spreads as far as 4 meters, and the sole can also spread Recently, the US Centers for Disease Control and Prevention issued an early warning that the new coronavirus can spread in the air up to 13 feet (عن 4 meters), and it may also be contaminated to the soles of shoes and cause transmission. This information is …