Bacteria in the gut influence how susceptible mice are to respiratory virus infections and the severity of these infections, research finds.

What is RSV and why is it so widespread among kids this year? Experts have answers, as well as tips to keep your family healthy.

A new tool may one day identify if your sniffles are the result of a viral or bacterial infection in less than an hour.

People who used e-cigarettes in the past were 21% more likely to develop respiratory disease, and current users had a 43% higher risk, a new study finds.

In a new study, people with an untreated vitamin D deficiency were almost twice as likely to test positive for COVID-19 as people without a deficiency.