Aeromonas belongs to the family
Aeromonadaceae, which are commonly found in aquatic
environments. They are opportunist pathogens and
causes infections due to the possession of various
virulence gene. We isolated and molecularly
characterized Aeromonas spp. from different water
samples (surface water, waste water, and portable water)
in the North-East of Tamaulipas. The isolates were
molecularly identified by the sequencing of the gyrB gene.
The potential pathogenicity of the isolates was
investigated by the PCR amplification of the hemolysin
virulence genes (aerA and hlyA) commonly found in
Three Aeromonas species consisting of 123 strains
were identified in this study. The species include A.
veronii (43.75%), A. hydrophila (43.75%) and A. caviae
(12.50%). The amplification of the virulent genes in the
isolates revealed that 89 strains possess the aerA
hemolytic gene while 31 strains possess the hlyA gene.
The strains which possess aerA gene include, 39 from
surfac, 49 wastewater and 1 from portable water. On the
other hand, none from portable water possess the hylA
gene while 12 from surface water and 19 from wastewater
has the hylA genes. The recovery of Aeromonas spp. from
different water samples particularly portable water
supply make portable water potential source through
which Aeromonas infection can be transferred and thus
must be properly treated before public distribution. This
observation also emphasizes the need for adequate public
Keywords : Aeromonas, Virulence, Infections, Genes, Water.