Study on 37 Japanese encephalitis patients at Thanh Hoa province in 2004 revealed that this disease was most prevalent among children under 15 years old and the highest incidence was in 5-9 year old group (51.4%). The river delta area had the highest rate (48.6%), and mountainous areas (32.4%), then coastal area (19.0%). The highest prevalence of the disease was from April to September, seasonally. The rate of patients received 2 shots of vaccines was 2.7%. The most common clinical symptoms were fever (94.6%), conscious disorders (94.6%), convulsion (89.2%), and rigid neck.
Encephalitis, Japanese ; Epidemiologic Studies