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Am. J. Trop. Med. Hyg., 73(2), 2005, pp. 470-473
Copyright © 2005 by The American Society of Tropical Medicine and Hygiene

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SHORT REPORT


ISOLATION OF ARBOVIRUSES FROM MOSQUITOES COLLECTED IN NORTHERN VIETNAM

JULIET E. BRYANT, MARY B. CRABTREE, VU SIN NAM, NGUYEN THI YEN, HOANG MINH DUC, AND BARRY R. MILLER*
Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado; Ministry of Health, Hanoi, Vietnam; National Institute for Hygiene and Epidemiology, Hanoi, Vietnam

 

ABSTRACT

In response to recent increases in cases of pediatric encephalitis with unknown etiology in northern Vietnam, surveillance for arbovirus activity was conducted in four provinces surrounding the city of Hanoi during June 2002 and July–August 2004. A total of 20,615 mosquitoes consisting of 19 species in 1,122 pools were processed for virus isolation; virus isolates were obtained from 44 pools. Sagiyama virus (11 isolates), Getah virus (15 isolates), Oya virus (13 isolates), and Akabane virus (4 isolates) were identified by immunofluorescence assay and sequence analysis of reverse transcription–polymerase chain reaction fragments. Surprisingly, no isolates of Japanese encephalitis (JE) virus were obtained. Isolation of Akabane virus, Oya virus, Getah virus, and Sagiyama virus is reported for the first time from Vietnam.

Received January 26, 2005. Accepted for publication March 13, 2005.

Acknowledgments: We thank the staff members of the National Institute of Hygiene and Epidemiology entomological laboratory for help in all field collections and morphologic identification of mosquitoes. We also thank S. Tong (CDC, Atlanta, GA) and R. Lanciotti (Division of Vector-Borne Infectious Diseases, CDC, Fort Collins, CO) for generously providing primer sequences. Juliet E. Bryant was supported by a fellowship from the Emerging Infectious Diseases Laboratory Training Program administered by the Association of Public Health Laboratories (http://www.aphl.org/).

* Address correspondence to Dr. Barry R. Miller, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO 80522. E-mail: brm4{at}cdc.gov

Authors’ addresses: Juliet E. Bryant, Mary B. Crabtree, and Barry R. Miller, Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO 80522, E-mail: brm4{at}cdc.gov. Vu Sin Nam, Ministry of Health, Hanoi, Vietnam. Nguyen Thi Yen and Hoang Minh Duc, National Institute for Hygiene and Epidemiology, Hanoi, Vietnam.




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