Impact of H1N1 Influenza Vaccination on Child Morbidity in Guinea-Bissau

Research output: Contribution to journalJournal articleResearchpeer-review


  • Olga Bengård Hansen
  • Amabelia Rodrigues
  • Cesario Martins
  • Rieckmann, Andreas
  • Christine Stabell Benn
  • Peter Aaby
  • Ane Bærent Fisker

Background: In addition to vaccines' specific effects, vaccines may have non-specific effects (NSEs) altering the susceptibility to unrelated infections. Non-live vaccines have been associated with negative NSEs. In 2010, a campaign with the non-live H1N1-influenza vaccine targeted children 6-59 months in Guinea-Bissau.

Methods: Bandim Health Project runs a health and demographic surveillance system site in Guinea-Bissau. Using a Cox proportional hazards model, we compared all-cause consultation rates after vs. before the campaign, stratified by participation status.

Results: Among 10 290 children eligible for the campaign, 60% had participated, 18% had not and for 22% no information was obtained. After the H1N1 campaign, the consultation rates tended to decline more for participants [HR = 0.80 (95% confidence interval, CI: 0.75; 0.85)] than for non-participants [HR = 0.68 (95% CI: 0.58; 0.79)], p = 0.06 for same effect.

Conclusion: The decline in the vaccinated group may have been smaller than the decline in the non-vaccinated group consistent with H1N1-vaccine increasing susceptibility to unrelated infections.

Original languageEnglish
JournalJournal of Tropical Pediatrics
Issue number5
Pages (from-to)446-456
Number of pages11
Publication statusPublished - 2019

Bibliographical note

A correction has been published:
Journal of Tropical Pediatrics, fmz009,

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