The strain was isolated from a patient sommetime during the years 1953-195 in Malaysia (Alexander et al., 1957) and described as a new serovar of the Autumnalis group.
In the list of 1967 (WHO, 1967) it is quoted as a recognized serovar.
In Dikken and Kmety's publication (1978) the serovar is placed in the subgroup Fort-Braggi.