Temporal Patterns of Influenza A and B in Tropical and Temperate Countries: What Are the Lessons for Influenza Vaccination? - RIIP - Réseau International des Instituts Pasteur Access content directly
Journal Articles PLoS ONE Year : 2016

Temporal Patterns of Influenza A and B in Tropical and Temperate Countries: What Are the Lessons for Influenza Vaccination?

1 Netherlands Institute for Health Services Research
2 ISP - Instituto de Salud Pública de Chile
3 Istanbul University
4 MINSA - Ministry of Health [Nicaragua]
5 Ministry of Health [Morocco]
6 ISS - Istituto Superiore di Sanità = National Institute of Health
7 CDC - Centers for Disease Control and Prevention [Atlanta]
8 INSPI - Instituto Nacional de Investigación en Salud Pública [Guayaquil, Ecuador]
9 MSPAS - Ministerio de Salud Publica y Asistencia Social [Guatemala]
10 US Centers for Disease Control
11 WITS - University of the Witwatersrand [Johannesburg]
12 Ministry of Health
13 Institut Pasteur de Côte d'Ivoire
14 MINSAL - Ministerio de Salud de El Salvador
15 Ministry of Health [Bhoutan]
16 US Centers for Disease Control and Prevention
17 Chinese Center for Disease Control and Prevention
18 Ministry of Health
19 Instituto nacional de saude
20 IPM - Unité de Virologie [Antananarivo, Madagascar]
21 National Academy of Medical Sciences of Ukraine
22 ESR - Institute of Environmental Science and Research
23 Astana Center of Sanitary Epidemiology Expertise
24 US Naval Medical Research Unit n°2
25 Instituto Nacional de Enfermedades Respiratorias “Dr. Emilio Coni”
26 Ministry of Health [Costa Rica]
27 NIHE - National Institute of Hygiene and Epidemiology [Hanoi, Vietnam]
28 SESAL - Ministry of Health [Honduras]
29 National Influenza Center
30 Centre Pasteur du Cameroun
31 DHAISS - Office of Health Protection, Woden, ACT, Australia
32 Public Health England [London]
33 National Institute of Health
34 University of Pretoria [South Africa]
35 Netherlands Institute for Health Services Research
Selim Badur
  • Function : Author

Abstract

INTRODUCTION: Determining the optimal time to vaccinate is important for influenza vaccination programmes. Here, we assessed the temporal characteristics of influenza epidemics in the Northern and Southern hemispheres and in the tropics, and discuss their implications for vaccination programmes. METHODS: This was a retrospective analysis of surveillance data between 2000 and 2014 from the Global Influenza B Study database. The seasonal peak of influenza was defined as the week with the most reported cases (overall, A, and B) in the season. The duration of seasonal activity was assessed using the maximum proportion of influenza cases during three consecutive months and the minimum number of months with ≥80% of cases in the season. We also assessed whether co-circulation of A and B virus types affected the duration of influenza epidemics. RESULTS: 212 influenza seasons and 571,907 cases were included from 30 countries. In tropical countries, the seasonal influenza activity lasted longer and the peaks of influenza A and B coincided less frequently than in temperate countries. Temporal characteristics of influenza epidemics were heterogeneous in the tropics, with distinct seasonal epidemics observed only in some countries. Seasons with co-circulation of influenza A and B were longer than influenza A seasons, especially in the tropics. DISCUSSION: Our findings show that influenza seasonality is less well defined in the tropics than in temperate regions. This has important implications for vaccination programmes in these countries. High-quality influenza surveillance systems are needed in the tropics to enable decisions about when to vaccinate.
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Dates and versions

pasteur-01675327 , version 1 (04-01-2018)

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CC0 - Public Domain Dedication

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Saverio Caini, Winston Andrade, Selim Badur, Angel Balmaseda, Amal Barakat, et al.. Temporal Patterns of Influenza A and B in Tropical and Temperate Countries: What Are the Lessons for Influenza Vaccination?. PLoS ONE, 2016, 11 (3), pp.e0152310. ⟨10.1371/journal.pone.0152310⟩. ⟨pasteur-01675327⟩
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