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Original Article
Published at www.nejm.org February 25, 2004 (10.1056/NEJMoa040419)

Avian Influenza A (H5N1) in 10 Patients in Vietnam
Tran Tinh Hien, M.D., Nguyen Thanh Liem, M.D., Nguyen Thi Dung, M.D., Luong Thi San, M.D., Pham Phuong Mai, M.D., Nguyen van Vinh Chau, M.D., Pham Thi Suu, M.D., Vo Cong Dong, M.D., Le Thi Quynh Mai, M.D., Ph.D., Ngo Thi Thi, M.D., Dao Bach Khoa, M.D., Le Phuc Phat, M.D., Nguyen Thanh Truong, M.D., Hoang Thuy Long, M.D., Ph.D., Le Truong Giang, M.D., Ph.D., Nguyen Dac Tho, M.D., Nguyen Thi Kim Tien, M.D., Ph.D., Le Hoang San, M.D., Le Van Tuan, M.D., M.P.H., Christiane Dolecek, M.D., Tran Tan Thanh, B.Sc., Menno de Jong, M.D., Ph.D., Constance Schultsz, M.D., Ph.D., Peter Cheng, M.Sc., Wilina Lim, M.B., B.S., Peter Horby, M.B., B.S., Jeremy Farrar, F.R.C.P., D.Phil., for the World Health Organization International Avian Influenza Investigative Team

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ABSTRACT

Background Recent outbreaks of avian influenza A (H5N1) in poultry throughout Asia have had major economic and health repercussions. Human infections with this virus were identified in Vietnam in January 2004.

Methods We report the clinical features and preliminary epidemiologic findings among 10 patients with confirmed cases of avian influenza A (H5N1) who presented to hospitals in Ho Chi Minh City and Hanoi, Vietnam, in December 2003 and January 2004.

Results In all 10 cases, the diagnosis of influenza A (H5N1) was confirmed by means of viral culture or reverse transcriptase-polymerase chain reaction with primers specific for H5 and N1. None of the 10 patients (mean age, 13.7 years) had preexisting medical conditions. Nine of them had a clear history of direct contact with poultry (median time before onset of illness, three days). All patients presented with fever (temperature, 38.5 to 40.0°C), respiratory symptoms, and clinically significant lymphopenia (median lymphocyte count, 700 per cubic millimeter). The median platelet count was 75,500 per cubic millimeter. Seven patients had diarrhea. In all patients, there were marked abnormalities on chest radiography. There was no definitive evidence of human-to-human transmission. Eight patients died, one patient has recovered, and one is recovering.

Conclusions Influenza A (H5N1) infection, characterized by fever, respiratory symptoms, and lymphopenia, carries a high risk of death. Although in all 10 cases the infection appears to have been acquired directly from infected poultry, the potential exists for genetic reassortment with human influenzaviruses and the evolution of human-to-human transmission. Containment of influenza A (H5N1) in poultry throughout Asia is therefore urgently required.

Notice: Because of its potential public health implications, this article was published at www.nejm.org on February 25, 2004. It will appear in the March 18 issue of the Journal.

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