Transmission of SARS-CoV-2 from asymptomatic and presymptomatic individuals in healthcare settings despite medical masks and eye protection

We describe 3 instances of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission despite medical masks and eye protection, including transmission despite the source person being masked, transmission despite the exposed person being masked, and transmission despite both parties being masked....More...

Canada: 82% Delta vaccine breakthrough in Calgary hospital coronavirus outbreak

An outbreak of the Delta coronavirus variant at the Foothills Medical Centre in Calgary has seen 16 patients and six health-care workers tested positive for the variant. ...More...

India: 16% vaccine breakthrough in Delhi hospital coronavirus study

A small-scale study on 113 healthcare workers who had received at least one vaccine dose at a private hospital in Delhi found that 18 tested positive for Covid but all except one had mild symptoms. ...More...