Comparative analysis of the epidemiological and clinical profiles of influenza infection due to 2009 pHlNl, HlNl, H3N2 and B viroses in Abidjan, Cote d'ivoire

Abstract

Influenza can have various epidemiological and clinical characteristics. This study compares the epidemio-clinical profiles of influenza infections related to different viruses in the population of Abidjan. A review of surveillance data (2007-2010) on influenza was performed. We used Chi2 test to compare pro­ portions and simple linear regression and sequential logistic regression models for prediction profiles on Stata 12 software. In total 529 cases of influenza infection were recorded, including 60 cases of H1 N1 (11.3%), 177 cases of H3 N2 (33.5%), 34 cases of pH1 N1 (6.4%) and 258 cases of influenza B (48.8%). Fever prevailed with H1N1 (76. 1%). The patients with pH1 N1 were more likely to have cough (OR = 10.52, 95% CI: 1.713-64.575; versus H1 N1) and to be from the age group of 5-14 years (OR = 3.10, 95% CI: 1.316-7.301; versus influenza B). For patients with influenza H3N2, cough (OR = 6.3, 95% CI: 2.466-16.347) and arthralgia/myalgia (OR = 2.54, 95% CI: 1.083-5.948) were the best predictors (versus influenza H1Nl). The identification of specific profiles in our study can improve the method of diagnosis and surveillance of influenza.