Vaccine efficacy and control measures in pertussis

Area of Science:

• * Epidemiology and Public Health
• * Vaccinology and Immunology

Background:

• * Pertussis (whooping cough) outbreaks pose a significant public health concern, particularly in school settings.
• * Accurate estimation of pertussis vaccine efficacy is crucial for public health policy and vaccination program evaluation.

Purpose of the Study:

• * To estimate the efficacy of the pertussis vaccine during a community outbreak.
• * To assess potential biases in vaccine efficacy estimates based on different case ascertainment methods.

Main Methods:

• * Conducted a study during a pertussis outbreak in primary schoolchildren in Pembrokeshire.
• * Compared vaccination status between notified pertussis cases and children with prolonged coughing symptoms (≥2 weeks).

Main Results:

• * Pertussis vaccine efficacy estimated at 88% using notified cases.
• * Efficacy estimate decreased to 68% when including all children with prolonged coughing bouts.
• * Notified cases were significantly less likely to have received the pertussis vaccination compared to other symptomatic children.

Conclusions:

• * Vaccine efficacy estimates based solely on notified cases may be biased.
• * Even lower efficacy estimates underscore the importance of pertussis immunization.
• * Increased efforts to improve pertussis vaccination coverage are highly recommended.