NEW YORK, May 23 (UPI) --It may not be the mythical fountain of youth, but the strength of the body's immune system could hold the key to a healthy, long life, experts told UPI. The concept of ...

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 ...

Experts highlight the importance of the Td vaccine in combating waning immunity against tetanus and diphtheria in adults.

Your immune system may be weak if you have frequent, severe, or extended infections. Learn more signs of a weak immune system.

As winter looms on the horizon, so do viruses and bacteria prepared to usher in annual colds and flu. The immune system is the first line of defense against these types of viral infections and ...