Abstract
During June and September, 1965, 14 agents were recovered from blood samples of swine collected in Gumma Prefecture.
Thirteen of the isolates were Japanese encephalitis virus, and one strain (JaGAn 18565) was identified as group A arbovirus.
This virus was referred to as Haruna virus because it was isolated from swine at Haruna area.
Haruna virus shared a common antigen with group A arbovirus and it was closely related antigenically to Getah virus recovered from mosquitoes in Malaya.
Sucrose-acetone extraction of infected suckling mouse brains with Haruna virus yielded hemagglutinins and antigens additionally treated with protamine sulfate were more potent than untreated antigens. Haruna virus produced the most potent hemagglutinin than any Getah complex viruses.
