[ad_1] Health 15:57 02.12.2020Short URL An American study showed signs of the coronavirus in the United States before the announcement of the first case in China. A retrospective study of blood samples taken by Americans in December 2019 found that some of them had been infected with Covid-19 even before …
Read More »Covid-19 was present in the United States before the pandemic in China, concludes a US study
