Aetiology of Acute Undifferentiated Fever Among Children Under the Age of Five in Vietnam: A Prospective Study oleh Xuan Duong Tran, Van Thuan Hoang, Thi Thuy Duong Dang, Thi Phuong Vu, Minh Manh To, Trong Kiem Tran, Manh Dung Do, Duy Cuong Nguyen, Quoc Tien Nguyen, Philippe Colson, Philippe Parola, Pierre Marty, Philippe Gautret