Is there any proof of the contagiousness of viruses?
https://twitter.com/erlhel/status/1241419472130445314">https://twitter.com/erlhel/st... #coronavirus #COVID19
https://twitter.com/erlhel/status/1241419472130445314">https://twitter.com/erlhel/st... #coronavirus #COVID19
Anyone can provide links to failed attempts of proving the contagiousness of viruses? #coronavirus #COVID19