What is it?
–Herd or Community Immunity is when a sufficient proportion of a population has become immune to an infectious disease agent such that person-to-person spread is unlikely or unsustainable.
How is Community Immunity achieved?
–Recovery from illness
•Low risk agent - “Chicken Pox parties”
•Hazardous if high-risk infection
•Live attenuated, inactivated or fractionated virus or bacteria that generates an active immune response
–Duration of protection (years) may vary – series or booster
•Temporary protection (months) through antibody administration
–Maternal to fetal circulation
–Gamma Globulin for Hepatitis A, Rabies Immune Globulin administration
•Mumps outbreak onboard USS Fort McHenry 2019
•Highly contagious agent - higher community immune threshold
•Immune titer – blood draw for lab testing
•Recruit populations, college students
–Agent Naïve population
•Impact of smallpox on Native American populations
CAPT William C. Brunner
Medical Corps, U.S. Navy
Marine Forces Reserve
Marine Forces North