Epidemiology of parainfluenza virus types 1, 2 and 3 infections based on virus isolation between 2002 and 2011 in Yamagata,Japan |
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| Authors: | Katsumi Mizuta Chieko Abiko Yoko Aoki Tatsuya Ikeda Tsutomu Itagaki Fumio Katsushima Yuriko Katsushima Yoko Matsuzaki Masahiro Noda Hirokazu Kimura Tadayuki Ahiko |
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| Affiliation: | 1. Department of Microbiology, Yamagata Prefectural Institute of Public Health, Yamagata, Yamagata 990‐0031;2. Yamanobe Pediatric Clinic, Yamanobe, Yamagata 990‐0301;3. Katsushima Pediatric Clinic, Yamagata, Yamagata 990‐2461;4. Department of Infectious Diseases, Yamagata University Faculty of Medicine, Yamagata, Yamagata 990‐9585;5. Infectious Diseases Surveillance Center, National Institute of Infectious Diseases, 4‐7‐1, Gakuen, Musashimurayama, Tokyo 208‐0011, Japan |
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| Abstract: | To clarify the epidemiology of viral acute respiratory infections (ARIs), 305 human parainfluenza virus types 1 (HPIV1), 154 HPIV2 and 574 HPIV3 strains were isolated from 16,962 nasopharyngeal swabs obtained between 2002 and 2011 at pediatric clinics in Yamagata, Japan. The total isolation frequency for HPIV1–3 was 6.1%. Unlike HPIV1 infections, HPIV3 showed clear seasonality with yearly outbreaks in the spring–summer season. HPIV2 tended to appear biannually in autumn–winter. Although no reliable techniques for the laboratory diagnosis of these infections have been established, the present results suggest that HPIV1–3 are an important causative agent of ARIs in children. |
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| Keywords: | acute respiratory infection epidemiology parainfluenza seasonality |
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