fix grmmar and can you tell me whihc part was revised?
Measles can be prevented with the MMR vaccine, which is a live, attenuated vaccine that provides protection from measles, mumps, and rubella. Two doses are 97% effective against measles, which are given at 12 months and 18 months after the baby is born (CDC, 2021). When injected into the body, it simulates the immune system's ability to recognise foreign antigens and produce antibodies. The live virus does not trigger a live infection as it contains a weakened variant of measles that is still recognised by the immune system (Government of Canada, 2019).