Seasonal Influenza Vaccine Effectiveness in Preventing Laboratory Confirmed Influenza in 2014-2015 Season in Turkey: A Test-Negative Case Control Study

Hekimoglu C. H., Emek M., Avci E., Topal S., Demiroz M., ERGÖR G.

BALKAN MEDICAL JOURNAL, vol.35, no.1, pp.77-83, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 1
  • Publication Date: 2018
  • Doi Number: 10.4274/balkanmedj.2017.0487
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.77-83
  • Keywords: Influenza, seasonal, vaccine, surveillance, effectiveness, EFFICACY, HOSPITALIZATIONS, DESIGNS
  • Dokuz Eylül University Affiliated: Yes


Background: Influenza has an important public health impact worldwide with its considerable annual morbidity among persons with or without risk factors and its serious complications among persons in high-risk groups. The seasonal influenza vaccine is essential for preventing the burden of influenza in a population. Since the vaccine is reformulated each season according to the virus serotypes in circulation, its effectiveness can vary from season to season. Vaccine effectiveness is defined as the relative risk reduction in vaccinated individuals in observational studies.