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Abstract Title:

Early Measles Vaccination During an Outbreak in the Netherlands: Short-Term and Long-Term Decreases in Antibody Responses Among Children Vaccinated Before 12 Months of Age.

Abstract Source:

J Infect Dis. 2019 Jul 19 ;220(4):594-602. PMID: 30972418

Abstract Author(s):

Iris D Brinkman, Jelle de Wit, Gaby P Smits, Hinke I Ten Hulscher, Maria C Jongerius, Taymara C Abreu, Fiona R M van der Klis, Susan J M Hahné, Marion P G Koopmans, Nynke Y Rots, Debbie van Baarle, Robert S van Binnendijk

Article Affiliation:

Iris D Brinkman

Abstract:

BACKGROUND: The majority of infants will not be protected by maternal antibodies until their first measles vaccination, between 12 and 15 months of age. This provides incentive to reduce the age at measles vaccination, but immunological consequences are insufficiently understood, and long-term effects are largely unknown.

METHODS: A total of 79 infants who received early measles vaccination between 6 and 12 months age and a second dose at 14 months of age were compared to 44 children in a control group who received 1 dose at 14 months of age. Measles virus-specific neutralizing antibody concentrations and avidity were determined up to 4 years of age.

RESULTS: Infants who first received measles vaccination before 12 months of age had a long-term decrease in the concentration and avidity of measles virus-specific neutralizing antibodies, compared with infants in the control group. For 11.1% of children with a first dose before 9 months of age, antibody levels at 4 years of age had dropped below the cutoff for clinical protection.

CONCLUSIONS: Early measles vaccination provides immediate protection in the majority of infants but yields a long-term decrease in neutralizing antibody responses, compared to vaccination at a later age. Additional vaccination at 14 months of age does not improve this. Over the long term, this may result in an increasing number of children susceptible to measles.

Study Type : Human Study

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