USA: Covid vaccine breakthrough in three more tigers

San Diego Zoo officials announced Wednesday that three of their Malaysian tigers have COVID-19, marking the first wildlife cases the organization has reported since vaccinating hundreds of animals this summer....More...

USA: At least 125,000 vaccine breakthrough infections, 1,400 dead

At least 125,000 fully vaccinated Americans have tested positive for Covid and 1,400 of those have died, according to data collected by NBC News. ...More...

Just 2% of #coronavirus−positive individuals carry 90% of the virus circulating in communities

We analyzed data from saliva-based COVID-19 screening deployed on the University of Colorado Boulder campus. Our dataset is unique in that all SARS-CoV-2−positive individuals reported no symptoms at the time of saliva collection, and therefore were infected but asymptomatic or presymptomatic....More...