Taking a COVID-19 test at home seems simple enough: If you get a line, you're positive for the coronavirus. But what if your results aren't so obvious? For instance, if you only get a very faint line ...

I promise I’m going to give COVID-19 and flu topics a rest soon — just as soon as those viruses leave me alone. Not long ago, I was feeling rundown and had post-nasal drip, a sore throat and a ...