Diseases, Conditions, Syndromes

Coronavirus testing, immunity: What we know

Questions around coronavirus testing and immunity are top of mind as the pandemic continues to spread and potential vaccines undergo trials.

Diseases, Conditions, Syndromes

Five million begin lockdown in Australian city

Five million people in Australia's second-biggest city began a new lockdown Thursday, returning to tough restrictions just weeks after they ended as Melbourne grapples with a resurgence of coronavirus cases.