A new study analyzing the immune response to COVID-19 in a Catalan cohort of health workers sheds light on an important question: does it matter whether a person was first infected or first vaccinated ...

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...

Make sure you get a flu vaccine every year to lower the risk of getting and spreading the virus. The flu is most contagious during the first three days after your symptoms develop. To prevent ...