Lowering Covid-19 cases is 'best thing' US can do to improve chances that vaccines will continue working, expert says
The first Biden-era vaccine against Covid-19 is moving toward market, but new bumps could trip up the big launch
Common genetic test often wrong when identifying rare disease-causing variants such as BRCA1 and BRCA2, study says
The US just saw its lowest Covid-19 daily case count since October. But here's why experts are still worried
