Millions of people undergo joint replacement surgery every year. To prevent infection, doctors often give them a second antibiotic — but new research suggests this can backfire. Adding a second antibiotic at the time of hip and knee replacement surgery may actually increase infections, researchers in Australia found. “Given the number of joint replacements performed…  read on >  read on >

Yellow fever may be resurfacing in the United States, thanks to climate change. The mosquito-borne viral illness decimated southern U.S. cities from 1820 to 1905, and now a new report says it could return to those areas. One of the potential reasons for a yellow fever resurgence? Global warming, because mosquitoes love warm, wet weather.…  read on >  read on >

An inexpensive medication long used for depression and migraines now has a clinical trial to back up its off-label use for another condition that lowers quality of life: irritable bowel syndrome (IBS). In the study, British researchers found that those taking amitriptyline were almost twice as likely as those taking a placebo to see an…  read on >  read on >

Many breast cancer survivors take a hormonal drug after cancer treatment to stave off a recurrence, but new research suggests these drugs may be less effective in women who are obese. Breast cancer cells in hormone-positive breast cancers are fueled by the female sex hormone estrogen. Aromatase inhibitor medications lower estrogen levels by stopping an…  read on >  read on >