Herd Immunity

WHAT IS HERD IMMUNITY?

A situation in which a sufficient proportion of a population is immune to an infectious disease (through vaccination and/or prior illness) to make its spread from person to person unlikely. Even individuals not vaccinated (such as newborns and those with chronic illnesses) are offered some protection because the disease has little opportunity to spread within the community (CDC Definition).

EVERYTHING YOU NEED TO KNOW

• Can Vaccinated People Infect Unvaccinated People?

• Herd Immunity: Fact or Fiction?

• Vaccinating the Herd

REAL WORLD CASES

• Measles Epidemic Despite 99% Vaccination Rate

• The Untold Story of Measles

• Recently Vaccinated While Spreading Disease

• Whooping Cough Resurgence from Vaccinated

• Whooping Cough Despite Vaccination

• Measles Despite Vaccination

• Fully Immunized Measles Outbreak

ANTIBODIES / OUTBREAKS / HERD IMMUNITY

• What are the limits of adjuvanticity?

• Antibodies are not required for immunity against some viruses

• B cell maintenance protects against fatal viral infection independent of adaptive immunity

• Severe tetanus in immunized patients with high anti tetanus titers

• Waning Protection: Vaccine development needs a booster shot USA Today

• Waning protection after fifth dose of acellular pertussis vaccine

• Chickenpox outbreak in a highly vaccinated school population

• Whooping cough outbreak on Long Island

• Fordham University mumps outbreak jumps campuses

• Herd immunity and compulsory vaccination does the theory justify the law

ASYMPTOMATIC TRANSMISSION & SHEDDING

• FDA study helps provide an understanding of rising rates of whooping cough

• Acellular pertussis vaccination facilitates bordetella parapertussis infection

• The impact of parental postpartum pertussis vaccination on infection in infants

• Finding the who in whooping cough