This NIHR-funded study found that almost a fifth of children aged five to 15 years who visited their GP with persistent cough showed signs of recent whooping cough infection, despite having a booster vaccination before school age. These data, from 22 GP practices in Thames Valley UK, describe the duration of vaccine-induced immunity and the burden of disease in adolescents. This may inform policy discussion about the potential need for a national adolescent whooping cough booster programme in the UK.
Why was this study needed?
Whooping cough (pertussis) is one of the most common vaccine preventable diseases causing almost 300,000 childhood deaths a year worldwide. Primary vaccine coverage in the UK has been more than 90% since the vaccine was introduced in 1992. A pre-school booster vaccination, introduced in 2001, has achieved about 80% coverage. The effectiveness of vaccine fades over time and UK incidence of whooping cough in older children and adults has been increasing since 2011. A national outbreak was declared in the UK in April 2012.
In the last decade a number of other countries, including Australia, Canada, France, Germany and the US, have introduced an adolescent booster vaccination. In January 2012 the UK Joint Committee on Vaccination and Immunisation (JCVI) reviewed the need for an adolescent booster vaccination and concluded that further research was needed to estimate the burden of disease in the UK. The current study estimated the prevalence and clinical severity of whooping cough in school age children who went to their GP with a persistent cough.
What did this study do?
This prospective cohort study recruited 279 children aged 5 to 15 years between November 2010 and December 2012 who presented with persistent cough in 22 general practices in the Thames Valley, England. Of these, 261 had received whooping cough vaccinations, but there was variation in whether they had also received the preschool booster or other combinations of vaccine. Recent whooping cough infection was diagnosed using laboratory tests. The authors used a reliable approach as they recruited children to the study without healthcare providers knowing if they had confirmed whooping cough or not.
What did it find?
- A fifth of all children with persistent coughing had evidence of recent whooping cough infection, whether they were fully vaccinated or not.
- Whooping cough was more than three times as common in children who had received the pre-school booster seven or more years ago than in children who had received the booster vaccination less than seven years ago.
What does current guidance say on this issue?
Current 2015 Public Health England guidance states that the objective of the childhood immunisation programme is to provide a minimum of four doses of a pertussis-containing vaccine. The primary course of whooping cough vaccination consists of three doses of a pertussis-containing product. It is recommended for all infants from two months up to ten years of age. The fourth dose should be given as part of the pre-school booster, at three years and four months of age or soon after.
Currently, routine immunisation against whooping cough is not recommended for those aged ten years and over, except for pregnant women or as part of outbreak control.
What are the implications?
Whooping cough remains a significant cause of persistent cough among school children in the UK even after the implementation of the preschool booster vaccination and despite high levels of coverage. Burden of illness studies such as this informs cost-effectiveness calculations and will be important in discussions about an adolescent whooping cough booster vaccination policy in the UK.
Only children attending Thames Valley GP practices were studied. This relatively small sample may not be representative of the range of vaccine experiences of children across the UK as a whole.
If an adolescent booster vaccination were to be recommended in the UK it would likely be administered at 14 years of age, at the same time as routine meningitis C, tetanus, diphtheria, and inactivated polio adolescent booster vaccinations.
Wang K, Fry NK, Campbell H. Whooping cough in school age children presenting with persistent cough in UK primary care after introduction of the preschool pertussis booster vaccination: prospective cohort study. BMJ. 2014;348:g3668. This project was funded by the National Institute for Health Research School for Primary Care Research.
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JCVI sub-committee on adolescent vaccinations meeting: January 2012. London: Joint Committee on Vaccination and Immunisation; 2012
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PHE. Pertussis: the green book, chapter 24. In: Immunisation against infectious disease. Public Health England. 2013. Last updated: 28 April 2015
PHE. Pertussis: guidance, data and analysis. Public Health England. 2014. Available from: https://www.gov.uk/government/collections/pertussis-guidance-data-and-analysis
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