George Washington confronted a smallpox epidemic with a belief in science—and a controversial plan. George Washington strikes a confident pose after the victorious Battle of Princeton in this ...

The incubation period for the coronavirus is between 2 and 14 days. On average, COVID-19 symptoms appear around 5 days after exposure, but this can vary. Learn more.

Mallon herself had no symptoms of typhoid and didn’t believe she could be spreading it. It’s likely Mallon never understood the meaning of being a carrier, particularly since she exhibited no ...