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Surveillance of influenza viruses isolated from travellers at Nagoya International Airport

Published online by Cambridge University Press:  01 June 2000

K. SATO ,
T. MORISHITA ,
E. NOBUSAWA ,
Y. SUZUKI ,
Y. MIYAZAKI ,
Y. FUKUI ,
S. SUZUKI  and
K. NAKAJIMA
K. SATO
Affiliation:
Department of Microbiology, Aichi Prefectural Institute of Public Health, Nagoya 462-8576, Japan
T. MORISHITA
Affiliation:
Department of Microbiology, Aichi Prefectural Institute of Public Health, Nagoya 462-8576, Japan
E. NOBUSAWA
Affiliation:
Department of Virology, Medical School, Nagoya City University, 1 Kawasumi, Mizuhocho, Mizuho-ku, Nagoya 467, Japan
Y. SUZUKI
Affiliation:
Department of Microbiology, Aichi Prefectural Institute of Public Health, Nagoya 462-8576, Japan
Y. MIYAZAKI
Affiliation:
Department of Microbiology, Aichi Prefectural Institute of Public Health, Nagoya 462-8576, Japan
Y. FUKUI
Affiliation:
Nagoya International Airport Quarantine Office, Toyoyama-cho, Aichi, 480-01, Japan
S. SUZUKI
Affiliation:
Nagoya International Airport Quarantine Office, Toyoyama-cho, Aichi, 480-01, Japan
K. NAKAJIMA
Affiliation:
Department of Virology, Medical School, Nagoya City University, 1 Kawasumi, Mizuhocho, Mizuho-ku, Nagoya 467, Japan
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Abstract

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In order to conduct a survey of influenza viruses entering Japan via travellers arriving by airplanes, gargle solutions were collected from passengers who reported to the quarantine station of Nagoya International Airport complaining of respiratory symptoms. From 504 samples collected between August 1996 and March 1999, 30 influenza virus strains were isolated. Twenty-eight of the isolates were influenza A (H3N2) viruses and two were influenza B viruses. No H1N1 virus was isolated. Among 28 isolates of H3N2 virus, 3 strains were obtained outside the influenza season. Nucleotide sequences of the haemagglutinin (HA) genes of these isolates along with those from domestic patients were analysed in order to determine the influence of imported influenza viruses by travellers on epidemics in Japan. From the phylogenetic and chronological aspects, the possibility was suggested in one case in 1997/8 and two in the 1998/9 season that imported virus by travellers may have influenced the domestic influenza epidemics.

Type
Research Article
Information
Epidemiology & Infection , Volume 124 , Issue 3 , June 2000 , pp. 507 - 514
Copyright
© 2000 Cambridge University Press