Bulletin of the World Health Organization

The population-based burden of influenza-associated hospitalization in rural western Kenya, 2007–2009

Daniel R Feikin, Maurice O Ope, Barrack Aura, James A Fuller, Stella Gikunju, John Vulule, Zipporah Ng’ang’a, M Kariuki Njenga, Robert F Breiman & Mark Katz

Volume 90, Number 4, April 2012, 256-263A

Table 1. Patients hospitalized for respiratory illness and patients positive for influenza virus, by age and type of virus, Bondo district, Kenya, June 2007–May 2009

Characteristic No. (%) of enrolled patients
Aged < 5 years Aged ≥ 5 years Total
With respiratory illness 2301 (100) 1623 (100) 3924 (100)
With collected swabs 1382 (60.1) 1007 (62.0) 2389 (60.9)
With tested swabs 1213 (87.8)a 866 (86.0)a 2079 (87.0)a
PCR-positive for viral RNAb 167 (13.8)c 242 (28.0)c 409 (20.0)c
Influenza, A or B virus 83 (6.8)c 121 (14.0)c 204 (9.8)c
Influenza, A virus 81 (6.7)c 96 (11.1)c 177 (8.5)c
Influenza, B virus 3 (0.2)c 25 (2.9)c 28 (1.3)c
Influenza, A and B viruses 1 (0.1)c 0 (0.0)c 1 (0.05)c

PCR, polymerase chain reaction; RNA, ribonucleic acid.

a Denominator: patients with swabs collected.

b One patient, aged < 5 years, was positive for both influenza A virus and influenza B virus.

c Denominator: patients with swabs tested.