The comparative pathogenicity of four serovars of Actinobacillus (Haemophilus) pleuropneumoniae [pigs]
1990
Rogers, R.J. | Eaves, L.E. | Blackall, P.J. | Truman, K.F. (Queensland Dept. of Primary Industries, Yeerongpilly (Australia). Animal Research Inst.)
Of 60 pigs tested, the proportion of pigs dying and developing gross lesions following infection was significantly greater for pigs given serotype 1 than for each of the other 3 serotypes (7, 3 and 2), which did not differ significantly from each other. The lethal infections were characterised by a severe acute fibrinohaemorrhagic necrotising pleuropneumonia, whereas non-lethal cases had lung lesions ranging from necrotising purulent pleuropneumonia to abscessation. Significant differences between isolates in proportions of tissues culture positive for A. pleuropneumonia for serovars 7 and 2, but not for serovars 3 and 1 suggested that isolates may vary in virulence within serovars, but more detailed studies are needed to clarify this point.
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