INFECTION

Respiratory viruses, including COVID, flu and RSV, are spreading across the U.S. — and so are other infections. So how long are you contagious with some of the more common ones? Find out here.

New York has one confirmed polio case but health officials say wastewater surveillance indicates there may be hundreds of people infected. While most Americans are vaccinated against polio, experts say the case should serve as a wake-up call to those who aren’t. Here’s what you need to know.

Dr. Norberto Rodriguez-Baez from UT Southwestern and Children’s Health discusses the national attention drawn to reported hepatitis cases in children.

South African scientists are warning that the new omicron variant may be causing more reinfections among COVID-19 survivors than earlier virus mutants.