Wearing a medical-grade mask or respirator can decrease the risk of infection. Good hand hygiene and proper sneezing and cough etiquette can also decrease the risk of transmission.

Whether Covid-19 was unleashed by a laboratory mishap or spilled over from animals remains an enduring, fiercely contested ...

Proponents of the lab-leak hypothesis highlight that the earliest known Covid-19 cases emerged in Wuhan, China -- home to the ...