Over 312 million COVID-19 tests have already been administered in the United States. But even with all this testing being done, there are still lots of questions about it. What are these tests? Are they really effective for detecting...

The COVID-19 pandemic is a year old and the number of infections and deaths from this disease continues to climb.  Part of the strategy to control the virus' spread is the increased availability of virus testing sites. Community health centers, doctors' offices,...