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Whooping cough after stopping pertussis immunisation
Insights
Pertussis immunization did not significantly reduce whooping cough cases during a Shetland epidemic. The study found similar infection rates in both vaccinated and unvaccinated children, questioning routine pertussis vaccination effectiveness in this rural setting.
Area of Science:
- Epidemiology
- Immunology
- Public Health
Background:
- An epidemic of whooping cough (pertussis) affected children in rural Shetland.
- Pertussis immunization practices changed in July 1974, with vaccination being halted.
- The study population comprised 144 children under 16 years old.
Purpose of the Study:
- To investigate the effectiveness of pertussis immunization during a community-wide outbreak.
- To determine if vaccination status influenced the incidence of whooping cough in children.
- To assess the impact of the cessation of routine immunization on disease occurrence.
Main Methods:
- Retrospective study of children in a rural Shetland practice.
- Analysis of pertussis infection rates among 134 children based on immunization status.
- Comparison of disease incidence in children vaccinated before and after July 1974.
Main Results:
- Sixty-five out of 134 studied children contracted whooping cough.
- The incidence of pertussis infection was comparable between immunized and non-immunized children.
- Disease rates were similar in children born before and after the immunization policy change in July 1974.
Conclusions:
- The study found no evidence to support the routine use of pertussis immunization in the context of rural Shetland.
- Pertussis vaccination did not appear to confer significant protection during this specific epidemic.
- Further investigation may be warranted to understand factors influencing vaccine effectiveness in similar settings.
Abstract:
An epidemic of whooping cough occurred in a rural practice in Shetland, containing 144 children under 16. Before July 1974 all children were immunised against pertussis, but after that date immunisation was stopped. Of the 134 children studied, 93 had been immunised. Sixty-five of the children developed whooping cough. The incidence of infection was similar in those who had and had not been immunised. The incidence was also similar in those born before and after July 1974. There was no evidence to support the routine use of pertussis immunisation in rural Shetland.