PSA, the protein behind prostate cancer tests, is a known semen allergen. A look-alike protein from male dogs may explain first-time reactions.

A cat's paw strike, not its claws, caused bleeding inside a man's eye and later a cataract. Doctors say it may be the first case of its kind.

A woman's two-day eye irritation was caused by a live brown dog tick attached to her eyelid margin. Doctors say her garden-roaming dog was the likely link.

A mouse bite sent a lab researcher into anaphylaxis. Blood tests showed he was also sensitized to rats and hamsters he had never handled.

A toddler passed a thorny-headed worm that normally lives in rats. Her mother later recalled finding her with a cockroach in her mouth.

UF researchers found stem-like T cells that may keep the type 1 diabetes immune attack going for years, pointing to possible new drug targets.

A small PET study found lower dopamine nerve terminal markers in long COVID patients, tied to motivation and memory problems. A trial is planned.

U.S. drinking fell for the first time since the pandemic began, but heavy drinking among adults 50 to 64 rose over 36% since 2018, a new study found.

FDA granted priority review to ARIKAYCE's full approval bid for MAC lung disease, with a decision due Jan. 28, 2027. What patients should know.

Kids at high genetic risk whose gut microbiome stalled early had about 3 times the risk of type 1 diabetes. What the study shows and what parents can do.