Author(s): Dola Roy, Subharthi Pal, Sriparna Datta Ray and Sumit Home Chaudhari

Abstract: The following is an experimental approach attempting to delineate the possible effects of interaction between two pathogenic Aeromonads when co-infected within a fish model. The host fish Labeo rohita was challenged by a native (Aeromonas hydrophila) and an exotic (Aeromonas salmonicida) pathogenic Aeromonad individually and simultaneously at respective asymptomatic carrier doses (3 x 10⁷ cfu/ml and 2 x 10⁷ cfu/ml respectively). When inoculated individually no symptom was exhibited but during co-infection prominent symptoms of A. salmonicida infection (furunculosis) were observed. The haematological, immunological and biochemical parameters along with other general health indices exhibited highest degree of physiological deterioration in the co-infected condition (p & lt; 0.05, df = 3). The observed trend of sensitivity was of the following order: co-infected > A. hydrophila infected > A. salmonicida infected > control fishes. The results in general indicated the virulence pattern of invasive pathogens, newly adapted to tropical environments and the findings would further help us to decipher the competitive interaction among different bacterial strains leading to co-existence ultimately inducing pathogenicity.

Pages: 322-329  |  793 Views  104 Downloads

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