Whether or not a person with COVID-19 develops severe disease depends a lot on how their immune system reacts to the coronavirus...
By Rebecca Aicheler 17 Dec 2020
Babies are normally vaccinated against measles at 12 months old. But doctors are now suggesting having the shot as early as six months might be worthwhile for youngsters traveling overseas.
By Nicholas Wood, Alexis Pillsbury and Jean Li-Kim-Moy 28 Jun 2019