Add Yahoo as a preferred source to see more of our stories on Google. Palestinians tend to the wounded after an Israeli strike hit a building next to Al-Aqsa Hospital in the Gaza Strip on Jan. 10, ...

Supplements, surprising treatments, immunity-boosting vaccines and even exercises can help the immune system do its job ...

Herd immunity occurs when enough people in a group are immune to a specific infection that it cannot spread easily from person to person. Vaccination programs have been successful in creating herd ...

Why can the human immune system often remember a vaccination for a whole lifetime? Researchers at ...