It's officially flu season. You've been invited to a get-together with friends and would love to attend, but have been ...

Countries straining to contain a second wave of COVID-19 are turning to faster, cheaper but less accurate tests to avoid the delays and shortages that have plagued efforts to diagnose and trace those ...

Early in the coronavirus pandemic, U.S. President Donald Trump put his faith in a toaster-sized machine that could spit out test results in a matter of minutes.