Summary

A virus new to Middle America, the Chagres virus, was isolated in Panama from the blood of a patient who was infected with the virus. It was found to be pathogenic for suckling and weanling mice and to be sensitive to sodium desoxycholate. A hemagglutinin was demonstrated which exhibited unusual characteristics under certain conditions. No relationship of this virus to 49 other arboviruses could be demonstrated by means of the complement-fixation test. The presence of neutralizing antibody in human sera from one Panamanian community was demonstrated.