5 l
9
Źródełko
https://www.nature.com/articles/d41586-021-02187-1
https://www.sciencealert.com/over-a-third-of-covid-infections-are-truly-asymptomatic-says-massive-new-analysis
https://www.nature.com/articles/d41586-021-02187-1
https://www.sciencealert.com/over-a-third-of-covid-infections-are-truly-asymptomatic-says-massive-new-analysis
