North American Vaccine Message Board

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Biotech / Medical : North American Vaccine

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12:24 PM EST

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To: Don W Stone who wrote (358)	5/11/1998 11:12:00 PM
From: Cacaito	of 507

Pediatric Infectious Disease Journal Inmuniztion of children with pertussis toxoid decreases spread of pertussis within the family. In essence, the authors Birger Trollfors, John Taranger et all, claim "that this is the first time a pertussis vaccine (or any other vaccine )is proven to have a herd immunity value, albeit limited to intra familiar spread, not for the exposure in the community (i.e. schools)". The vaccine is Certiva, study from western Sweden. A very good article indeed, with very strong data in my view. Indirect protection for parents was 60%. Indirect protection for non-vaccinated younger children (not going to school) was 43%. No protection was proven for older siblings (going to schools). Of course, maybe is the first rigorous case of proven herd immunity, but the strong oral polio herd effect is very well known epidemiologically. But this is anyway a very good study, quite difficult to get done.

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