Impact of influenza on outpatient visits and hospitalizations among pregnant women in Catalonia, Spain

Luz Maria Vilca, Aman Verma, Maurizio Bonati, Magda Campins

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10 Citations (Scopus)


© 2018 Objective: To estimate outpatient visits and hospitalization rates due to cardiopulmonary illness attributable to influenza from 2008-09 to 2012-13 in a large cohort of pregnant women from Catalonia, Spain. Methods: We estimated the event rates occurring during influenza epidemic, influenza non-epidemic and non-influenza seasons, and by pregnancy status (one year before pregnancy, first, second and third trimester). We fitted quasi-Poisson models in order to identify the variables associated to higher event rates. Results: During influenza epidemic seasons, pregnant women in their second trimester had the highest rates of outpatient visits (153 per 10,000 women-months). An increased risk of outpatient visits was associated to first or second trimester (adjusted rate ratio (aRR) = 1.17; 95% CI, 1.10–1.23 and aRR, 1.36; 95% CI, 1.28–1.43, respectively) and having any comorbidity (aRR = 1.28; 95% CI, 1.21–1.36). Women during third trimester had the highest rates of hospitalizations (1.60 per 10,000 women-months), and an increased risk of hospitalization was significantly associated to third trimester (aRR, 1.85; 95% CI, 1.01–3.39), having any comorbidity (aRR, 1.93; 95% CI, 1.10–3.41) and the pandemic influenza season (aRR, 2.90 (1.81; 95% CI, 1.81–4.64). Conclusion: Our findings provide significant information regarding influenza burden of disease among pregnant women.
Original languageEnglish
Pages (from-to)553-560
JournalJournal of Infection
Publication statusPublished - 1 Dec 2018


  • Comorbidity
  • Hospitalization
  • Influenza
  • Outpatient visit
  • Pregnancy
  • Pregnancy trimesters


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