Effectiveness of annual flu vaccination until week four of season 2018/2019

e201904024

Authors

  • Paula Gras-Valentí Unidad de Epidemiología. Servicio de Medicina Preventiva. Hospital General Universitario de Alicante. Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL ). Alicante. España
  • Natividad Algado-Sellés Unidad de Epidemiología. Servicio de Medicina Preventiva. Hospital General Universitario de Alicante. Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL ). Alicante. España
  • Pablo Chico-Sánchez Unidad de Epidemiología. Servicio de Medicina Preventiva. Hospital General Universitario de Alicante. Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL ). Alicante. España
  • Ginger Giorgiana Cabrera-Tejada Unidad de Epidemiología. Servicio de Medicina Preventiva. Hospital General Universitario de Alicante. Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL ). Alicante. España
  • Juan Carlos Rodríguez-Díaz Servicio de Microbiología. Hospital General Universitario de Alicante. Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL ). Alicante. España.
  • José Sánchez-Payá Unidad de Epidemiología. Servicio de Medicina Preventiva. Hospital General Universitario de Alicante. Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL ). Alicante. España.

Keywords:

Influenza, Human, Vaccination, Influenza vaccines, Vaccination coverage, Treatment outcome

Abstract

Background: Annual flu vaccination is the most effective measure to prevent the disease and its complications. Vaccine effectiveness (EV) varies from season to season, requiring annual re-evaluation. The objective of this work was to estimate the preliminary effectiveness of the influenza vaccine until epidemiological week 4 of the 2018/2019 season, in patients admitted to a third level hospital.

Methods: The Test Negative Design (TDN) was carried out at the Hospital General Universitario de Alicante. Patients admitted with laboratory-confirmed influenza (RT-PCR positive for any influenza virus, in clinical sample of nasopharyngeal aspirate) and those with clinical suspicion of influenza and negative RT-PCR, from week 40 to week 4 of the 2018/2019 influenza season, were considered as controls. The vaccination coverage was calculated in the cases and in the controls, and the EV with its 95% confidence interval using the formula: EV = (1-Odds Ratio) x 100.

Results: We included 524 patients: 58 cases and 466 controls. The overall EV for prevention of influenza cases was 42.5 % (95% CI -17.1 to 71.8) and for those over 1 year of age 63.7 % (95% CI 25.4 to 82.3).

Conclusions: The 2018-2019 influenza vaccine is effective in preventing influenza cases in patients admitted up to week 4 of the 2018-19 season. Results are preliminary and may vary and should be re-evaluated at the end of the season.

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Published

2019-04-29

How to Cite

1.
Gras-Valentí P, Algado-Sellés N, Chico-Sánchez P, Cabrera-Tejada GG, Rodríguez-Díaz JC, Sánchez-Payá J. Effectiveness of annual flu vaccination until week four of season 2018/2019: e201904024. Rev Esp Salud Pública [Internet]. 2019 Apr. 29 [cited 2025 May 17];93:6 páginas. Available from: https://ojs.sanidad.gob.es/index.php/resp/article/view/1255

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