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Pertussis and influenza immunisation coverage of pregnant women in New Zealand

Background: Immunisation is an important public health policy and measuring coverage is imperative to
identify gaps and monitor trends. New Zealand (NZ), like many countries, does not routinely publish coverage
of immunisations given during pregnancy. Therefore, this study examined pregnancy immunisation
coverage of all pregnant NZ women between 2013 and 2018, and what factors affected uptake.
Methods: A retrospective cohort study of pregnant women who delivered between 2013 and 2018 was
undertaken using administrative datasets. Maternity and immunisation data were linked to determine
coverage of pertussis and influenza vaccinations in pregnancy. Generalised estimating equations were
used to estimate the odds of receiving a vaccination during pregnancy.
Results: From 2013 to 2018 data were available for 323,622 pregnant women, of whom 21.7% received
maternal influenza immunisations and 25.7% maternal pertussis immunisations. Coverage for both vaccines
increased over time, pertussis increased from 10.2% to 43.6% and influenza from 11.2% to 30.8%. The
odds of being vaccinated, with either vaccine, during pregnancy increased with increasing age and
decreasing deprivation. Compared to NZ European or Other women, Ma¯ori and Pacific women had lower
odds of receiving a maternal pertussis (OR:0.55, 95% CI: 0.54, 0.57; OR:0.60, 95% CI: 0.58, 0.62, respectively)
and influenza (OR: 0.69, 95% CI: 0.67, 0.71; OR:0.90, 95% CI: 0.87, 0.94, respectively) immunisations
during pregnancy. Women were also more likely to be vaccinated against pertussis if they
received antenatal care from a General Practitioner or Obstetrician compared to a Midwife. A similar pattern
was seen for influenza vaccination.
Conclusion: Gaps in maternal coverage for pertussis and influenza exist and work is needed to reduce
immunisation inequities

(c) 2020 Elsevier Ltd. All rights reserved.

Publication 
Vaccine (in press)
Author 
A. S. Howe, L. Pointon, N. Gauld, Paynter J., Willing E., Turner N.
doi number 
https://doi.org/10.1016/j.vaccine.2020.08.030
Type of Research 
Year 
2020
Menu Category 
Publication Date 
Friday, August 14, 2020

Last updated: Sep 2020