Abstract
Three hundred serum specimens were drawn from residents in the Lampung State, a southern part of Sumatera Island, Indonesia, during the period from August to September in 1965. Hemagglutination inhibition antibodies against dengue type 1 (Dl), Japanese encephalitis (JE), and yellow fever (YF) viruses were measured by the microtiter technique (Takatsy-Sever).
According to the data collected up to the present time, the following general and immunological conclusions have been obtained :
(1) D1 is fairly widely distributed.
(2) JE is thought to be endemic, though in minority.
(3) The antibodies against YF are detected. Because of the comparatively low titers, however, it is presumed that the positive YF reactions are probably due to crossing with other members of the arboviruses, especially dengue viruses.
Extended investigations along with the same line are being scheduled.
