Editor’s Note: After publication of this story, Virginia began to provide separate viral and antibody test data. Meanwhile, three other states and the CDC seem to be mixing their COVID-19 test types.

Product quality and yield, operational efficiency, and time-to-market continue to be dominant drivers in the semiconductor industry. Adding to this complexity is a diverse manufacturing and test ...

Rapid antigen tests are distributed at a center in Northeast D.C. in January. (Sarah L. Voisin/The Washington Post) The ever-shifting pandemic has taken another unexpected turn. In the United States, ...