Viruses in this study, because of the many antigenic overlappings, cannot all be identified on the basis of serological response alone. It appears highly probable, however, that JBE, dengue and EEE viruses are present, plus at least two others from group B (one of these possibly Ntaya) and at least one other from group A, closely related to Semliki Forest virus if not that virus. As a result of this preliminary survey an expedition was organized to attempt to isolate and thus actually identify the agents present. Testing of these latter materials is still under way.
Now with the Division of Communicable Disease Control, Commonwealth of Pennsylvania Department of Health, Harrisburg, Pennsylvania.