Affiliation: *National Institute of Health, Department of Medical Sciences
**Department of Virology I, National Institute of Infectious Diseases, Tokyo, Japan
Source: Dengue Bulletin 2004; 28: 1-6
A virological study was conducted in six hospitals spread across Thailand from 1999 to 2002. All four dengue serotypes were identified, of which DEN-1 was the most predominant.The predominant dengue serotypes changed every 1-2 years in three of the six hospitals and the predominant serotypes were different in different hospitals. DEN-1 was predominant in two hospitals during three years of the study period (2000-2002). DEN-4 was not isolated, or accounted for only a small percentage of the total isolates, except in one hospital in 2002.