You are using an older browser version. Please use a supported version for the best MSN experience.

Vaccination and the immune system

Videographic explaining how vaccinations work. Almost 20 million children missed out on potentially life-saving vaccinations last year, the UN said Monday, as surging measles cases highlighted "dangerous" gaps in efforts to shield kids from preventable illness. VIDEOGRAPHICS

Latest Science & Tech Video

image beaconimage beaconimage beacon