Figure 1.

Map of Thai-Myanmar border showing the study areas. The Thai strain of W. bancrofti microfilariae are collected from patients living in Tha Song Yang District, Tak Province (solid circle); and Sankhla Buri District, Kanchanaburi Province (solid circle), Thailand. The Myanmar strain of W. bancrofti microfilariae are collected from Myanmar migrants living in Mae Sot District, Tak Province (solid diamond), Thailand. The Myanmar migrants were from Rangon and Moulmein (solid square), Myanmar.