The effect of Pasteurella multocida toxin (PMT) produced by a toxigenic str
ain of serotype A: 12 (goat strain) on vero cell monolayer was studied. The
cytopathic effect was observed after 7 days of incubation at 37 degrees C
under 5% carbon-dioxide tension. The minimum cytopathic dose of the toxin w
as 5.8 mu g of the crude toxin. The study suggests that the cell culture (v
ero cells) assay cart be adopted for detection and quantitation of toxin Fr
om toxigenic strains of P. multocida.