Virus

Breast self-exams used to be recommended as a part of routine breast cancer screening. Here's why the guidelines changed and what experts recommend instead.

Whether intentional or not, the way mega-settlements in southeastern Europe from 6,000 years ago were laid out would have cut down on the spread of disease.

Severe flu infections can lead to a range of deadly complications, especially in people whose immune systems are compromised by age or disease.

Viruses and bacteria have been around for billions of years, but which came first?

Many factors affect the infectious period of seasonal influenza, commonly called "the flu," but there are some good rules of thumb for when it's safe to return to work or school.

A new study in mice suggests that dysfunctional mitochondria may change the composition of the gut microbiome and thus drive Crohn's disease.

A fever and a nasty cough can be symptoms of a range of respiratory illnesses. An antigen test that narrows down the culprits can speed up diagnosis and recovery.

Roundworms harbor viruses, which could be responsible for these parasites' painful symptoms in humans, scientists theorize.

Scientists identified more than 600 viruses in samples taken from bathrooms in the United States. The viruses infect bacteria — not people — and scientists say they may provide more benefits than causes for concern.

Data from the Southern Hemisphere hint that this year's flu shot lowers the risk of hospitalization among vulnerable demographics.