NATS 1670 Lecture Notes - Lecture 4: Attenuated Vaccine, Herd Immunity, Measles

• School: York University
• Department: Natural Science
• Course: NATS 1670
• Professor: Motti Anafi

Document Summary

Pre- & post- vaccine incidence of common preventable diseases: herd immunity describes a type of immunity that occurs when the vaccination of a portion of the population provides protection to unprotected individuals. Small fragments taking small pieces of the pathogen to create immunity. Herd immunity describes a type of immunity that occurs when the vaccination of a portion of the population provides protection to unprotected individuals. * maternal antibodies antibodies against measles and other infections: given to kids at 12 months of age once maternal antibodies are gone. * risk for back mutations in rare situations - viruses have back mutations - meaning they can revert back to their original severe state. * risk to immuno-compromised people (influenza: ex. polio - immune system is not effective against this is polio is located in your gut, the attenuated virus can infect non-vaccinated people, mmr: measles, mumps & rubella. * no back mutations, safe vaccine for everybody.