The newfound bacteria might shed light on how chlamydia came to infect host organisms, like us.
Humans have been fighting viruses throughout history. Here are the 12 viruses that are the world's worst killers, based on their mortality rates, or the sheer numbers of people they have killed.
An outbreak of COVID-19 in the U.S. seems inevitable. How will local governments and health care facilities respond?
Specialized respirators appear to protect medical staff against COVID-19, but they must be worn to work.
Lightning strikes kill wild animals relatively often, but the deaths of four rare gorillas represent a huge loss for the species.
Unique footage of a gray seal clapping underwater reveals a new way the animals communicate underwater … and is super cute.
U.S. health officials are working to prevent an outbreak at home while developing treatments and preventative countermeasures.
This parasitic infection hijacks rodent brains and infects people through dirty cat litter. There's a good chance you have it.