Molecular Identification of Adenoviruses Associated with Respiratory Infection in Egypt from 2003 to 2010
NAVAL MEDICAL RESEARCH UNIT NO 3 FPO NEW YORK 09527
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Human adenoviruses of species B, C, and E HAdV-B, C, -E are frequent causative agents of acute respiratory infections worldwide. As part of a surveillance program aimed at identifying the etiology of influenza-like illness ILI in Egypt, we characterized 105 adenovirus isolates from clinical samples collected between 2003 and 2010. Identification of the isolates as HAdV was accomplished by an immunofluorescence assay IFA and confirmed by a set of species and type specific polymerase chain reactions PCR. Of the 105 isolates, 42 were identified as belonging to HAdV-B, 60 as HAdV C, and 1 as HAdV-E. We identified a total of six co-infections by PCR, of which five were HAdV-BHAdV-C co-infections, and one was a co-infection of two HAdV-C types HAdV-5HAdV-6. Molecular typing by PCR enabled the identification of eight genotypes of human adenoviruses HAdV-3 n 22, HAdV-7 n 14, HAdV-11 n 8, HAdV-1 n 22, HAdV-2 20, HAdV-5 n 15, HAdV-6 n 3 and HAdV-4 n 1. The most abundant species in the characterized collection of isolates was HAdV-C, which is concordant with existing data for worldwide epidemiology of HAdV respiratory infections. We identified three species, HAdV-B, -C and -E, among patients with ILI over the course of 7 years in Egypt, with at least eight diverse types circulating.
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