The strain was isolated by Kotter in 1938 from an acutely ill native in the Military Hospital of Koetaradja, Atjeh, Sumatra, Indonesia. The isolate was typed by Schuffner and described by Kotter (1939) as a new serovar named djasiman. It appears first in the list of 1954 (Wolff and room, 1954) as also representing a new serogroup Djasman. In the list of 1967 (WHO, 1967) the serovar is listed in the Autamnalis group. In 1978 the serogroup Djasiman was reestablished by Dikken and Kmety (1978) containing the serovars djasiman, sentot, and gurungi. This rearrangement was accepted by the TSC (Manchester, 1986).