Disneyland Outbreak STUDY (Patient Zero not identified)

About Herd Immunity

The Concept of Herd Immunity

Pertussis Outbreak, Washington, 2012
Overall, 758 of 1,000 (75.8%) patients aged 3 months–10 years were up-to-date with the childhood diphtheria and tetanus toxoids and acellular pertussis (DTaP) doses. Receipt of Tdap was documented in 97 of 225 (43.1%) patients aged 11–12 years and in 466 of 604 (77.2%) patients aged 13–19 years. Estimated DTaP coverage in Washington among children aged 19–35 months was 93.2% for ≥3 doses and 81.9% for ≥4 doses in 2010; Tdap coverage in adolescents aged 13–17 years was estimated at 70.6% (3).

99% Fully Vaccinated during Outbreak at Harvard University

69 Cases of Mumps in Australia,  All Vaccinated

70 Cases of Whooping Cough In Reno County,  All Vaccinated (archived copy, original article edited out the vaccination status)

Disneyland: Failing Measles Vaccine to Blame

Outbreaks within Highly Vaccinated Populations: What About Herd Immunity?

Measles Outbreaks in China, 99% Compliance

Outbreak in Highly Vaccinated Population: USS Ardent, 2014