© 1988 Oxford University Press
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The Efficacy of Pertussis Vaccines under Conditions of Household Exposure
Further Analysis of the 197880 PHLS/ERL Study in 21 Area Health Authorities in England

*Ross Institute, London School of Hygiene and Tropical Medicine Keppel Street, London WC1E 7HT, UK.
Communicable Disease Surveillance Centre, Public Health Laboratory Service 61 Colindale Avenue, London NW9 5EQ, UK.
It has been reported that the efficacy of pertussis vaccines appears to be lower when assessed in household contact studies than when assessed in cohort analyses of general populations. This observation may be attributable in part to methodological factors in home contact studies, in particular to the Inclusion of retrospectively ascertained cases and of households In which the primary case constituted a vaccine failure. These biases are Illustrated using data from a study of the efficacy of pertussis vacdnes carried out by the Public Health Laboratory Service Epidemiological Research Laboratory PHLS/ERL in England during 19781980. This analysis reveals several factors which should be considered in the design, analysis and interpretation of household contact studies for evaluation of vaccine efficacy.
Revised 1 September 1987
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