 Tatlock finally thought he classified the pathogen as a virus.Later, in 1951, when the necessary technology became available to perform agglutination tests and cross-reference agglutination tests, they found that it was a species of the genus "Leptospira".At the time, the pathogen was thought to be called "Leptospira Autumnalis", but upon further study of the whole-genome, it was later reclassified as a serovar of "Leptospira noguchii".