Neighbor-joining network depicted using the PHYLIP package. The tree reveals genetic affinities among outbreak-associated and sporadic isolates of different serovars recovered in India. The asterisks indicate outbreak-associated strains. Aus, Australis; Can, Canicola; Cop, Copenhageni; Gri, Grippotyphosa; Heb, Hebdomadis; Ram, Ramisi; Rat, Ratnapura; Sax, Saxkoebing; Val, Valbuzzi.