Infectious Disease

Tobacco's link to lung cancer, stroke and heart attack is well-known. But smokers are also more likely to die from kidney failure, infections and breast cancer, a revised tally suggests.

Starting in October, an American doctor wrote almost every day, for six weeks, while she treated Ebola patients. Her eloquent writings offer a deeper look into a world we've had only glimpses of.

One of the most important medical advances may also be the simplest: hand-washing. It's the best defense against spreading disease. And its power was discovered long before anyone knew about germs.

California lawmakers are proposing new limits on the ability of parents to opt out of vaccinations. It's a response to a measles outbreak that originated in that state.

The father of a young child who had leukemia has a plea for other parents: Please vaccinate your children, because people with compromised immune systems, including his son, can't be vaccinated.