Journal
CURRENT OPINION IN INFECTIOUS DISEASES
Volume 25, Issue 3, Pages 243-249Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/QCO.0b013e328352f727
Keywords
basic reproduction number; critical vaccine coverage; herd immunity; herd protection; vaccination
Categories
Funding
- CSL
- Sanofi
- GSK
- Novartis
- Roche
- Wyeth
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Purpose of review This review summarizes herd immunity, focusing on conceptual developments with application to vaccination programs. Recent findings The conventional idea of herd immunity is based on the relationship between the transmission dynamics of infectious agents and population immunity. However, there have been some recent conceptual developments in vaccine 'herd immunity' or 'herd protection' that address the complexities of imperfect immunity, heterogeneous populations, nonrandom vaccine uptake and 'freeloaders'. Some vaccines may provide better protection than others; for instance, meningococcal conjugate vaccines are superior to polysaccharide vaccines, as is true of pneumococcal and Haemophilus influenzae type b vaccines. Achieving a very high uptake rate should be the target for certain vaccines, for example, measles vaccine, in order to prevent the disease effectively. Emerging issues, for example, waning of immunity after pertussis vaccination, are fresh challenges. Summary Herd immunity is a complex issue inherent to a vaccine and the population receiving the vaccine. We have more to learn and apply.
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