Attenuvax

Measles vaccine protects against becoming infected with measles.[1] Nearly all of those who do not develop immunity after a single dose develop it after a second dose.[1] When rates of vaccination within a population are greater than 92%, outbreaks of measles typically no longer occur; however, they may occur again if rates of vaccination decrease.[1] The vaccine's effectiveness lasts many years.[1] It is unclear if it becomes le... [wikipedia]