Association of RSV-A ON1 genotype with Increased Pediatric Acute Lower Respiratory Tract Infection in Vietnam

Keisuke Yoshihara, Minh Nhat Le, Michiko Okamoto, Anita Carolle Akpeedje Wadagni, Hien Anh Nguyen, Michiko Toizumi, Enga Pham, Motoi Suzuki, Ai Thi Thuy Nguyen, Hitoshi Oshitani, Koya Ariyoshi, Hiroyuki Moriuchi, Masahiro Hashizume, Duc Anh Dang, Lay Myint Yoshida

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42 Citations (Scopus)


Since the initial discovery of RSV-A ON1 in Canada in 2010, ON1 has been reported worldwide, yet information regarding its clinical impact and severity has been controversial. To investigate the clinical relevance of RSV-A ON1,acute respiratory infection (ARI) cases enrolled to our population-based prospective pediatric ARI surveillance at Khanh Hoa General Hospital, Central Vietnam from January 2010 through December 2012 were studied. Clinical-epidemiological information and nasopharyngeal samples were collected. Multiplex PCR assays were performed for screening 13 respiratory viruses. RSV-positive samples were further tested for subgroups (A/B) and genotypes information by sequencing the G-glycoprotein 2nd hypervariable region. Statistical analysis was performed to evaluate the clinical-epidemiological characteristics of RSV-A ON1. A total of 1854 ARI cases were enrolled and 426 (23.0%) of them were RSV-positive. During the study period, RSV-A and B had been co-circulating. NA1 was the predominant RSV-A genotype until the appearance of ON1 in 2012. RSV-related ARI hospitalization incidence significantly increased after the emergence of ON1. Moreover, multivariate analysis revealed that risk of lower respiratory tract infection was 2.26 (95% CI: 1.37-3.72) times, and radiologically-confirmed pneumonia was 1.98 (95% CI: 1.01-3.87) times greater in ON1 compared to NA1 cases. Our result suggested that ON1 ARI cases were clinically more severe than NA1.

Original languageEnglish
Article number27856
JournalScientific Reports
Publication statusPublished - 2016 Jun 16


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