Across the globe, many cat owners pick up a pet-linked parasite without ever knowing. In the United States alone, more than 40 million Americans are infected with Toxoplasma gondii — a brain parasite ...

"We have decoded how the parasite takes control of immune cells, converting them into moving "zombies" which spread the parasite in the body," said Antonio Barragan, professor at Stockholm University ...

Some people who've suffered through COVID-19 never quite feel 100 percent, stuck in the throes of a medical mystery centered around an impaired immune system. Long COVID isn't fully understood yet, ...

Feline infectious peritonitis, or FIP, is a serious and historically fatal disease in cats caused by a coronavirus. It behaves in many ways like severe coronavirus infections in humans, causing ...

Jack Knudson is an assistant editor for Discover Magazine who writes articles on space, ancient humans, animals, and sustainability, and manages the Planet Earth column of the print issue. View Full ...