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Induction of Maternal Immune Activation in Mice at Mid-gestation Stage with Viral Mimic PolyI:C
Published on: March 25, 2016
Effect of maternal immunisation with multivalent vaccines containing inactivated poliovirus vaccine (IPV) on infant
Nicholas C Grassly1, Nick Andrews2, Gillian Cooper3
1MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, UK.
Insights
Maternal immunization with diphtheria, tetanus, acellular pertussis and inactivated poliovirus vaccine (DTaP/IPV) in the UK may reduce infant protection against polio. Infants born to vaccinated mothers showed lower antibody responses to inactivated poliovirus vaccine (IPV).
Area of Science:
- Immunology
- Vaccinology
- Public Health
Background:
- The UK introduced maternal immunization with diphtheria, tetanus, acellular pertussis and inactivated poliovirus vaccine (DTaP/IPV) in 2012.
- Maternal vaccination aims to protect infants from vaccine-preventable diseases during their first months of life.
Purpose of the Study:
- To evaluate the impact of maternal DTaP/IPV immunization on the infant immune response to inactivated poliovirus vaccine (IPV).
- To assess poliovirus-specific neutralizing antibodies in infants at 2, 5, and 13 months of age.
Main Methods:
- A randomized, phase 4 study compared infants born to mothers receiving DTaP/IPV during pregnancy versus a non-randomized group whose mothers did not receive the vaccine.
- Poliovirus-specific neutralizing antibodies were measured at 2, 5, and 13 months of age.
Main Results:
- Infants born to mothers who received DTaP/IPV showed significantly lower seroconversion rates after three IPV doses compared to infants of unvaccinated mothers.
- At 13 months, seropositivity for poliovirus types 1-3 was lower in the DTaP/IPV maternal immunization group (57.2%, 42.6%, 37.0%) compared to the control group (90.9%, 90.9%, 70.0%).
Conclusions:
- Maternal DTaP/IPV immunization in the UK may lead to suboptimal protection against poliomyelitis in infants until their pre-school booster vaccination.
- Further research is needed to optimize infant immunization schedules in the context of widespread maternal vaccination programs.
Abstract:
Multivalent diphtheria, tetanus, acellular pertussis and inactivated poliovirus vaccine (DTaP/IPV) has been offered to pregnant women in the United Kingdom since 2012. To assess the impact of maternal DTaP/IPV immunisation on the infant immune response to IPV, we measured poliovirus-specific neutralising antibodies at 2, 5 and 13 months of age in a randomised, phase 4 study of Repevax or Boostrix/IPV in pregnancy and in a non-randomised group born to women not given DTaP/IPV in pregnancy. Infants whose mothers received DTaP/IPV were less likely to seroconvert after three IPV doses than those whose mothers did not receive DTaP/IPV. At 13 months of age, 63/110 (57.2 %), 46/108 (42.6 %) and 40/108 (37.0 %) were seropositive to types 1 to 3, compared with 20/22 (90.9 %), 20/22 (90.9 %) and 14/20 (70.0 %) (p-values 0.003, <0.001 and 0.012). UK infants whose mothers are given DTaP/IPV in pregnancy may be insufficiently protected against poliomyelitis until their pre-school booster.
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