Thirty water samples were collected, at two week intervals, from the estuary of the River Cocó. The aim
was to characterize the presence, distribution and types of Aeromonas spp, in the estuary of the River
Cocó, Ceara, Brazil (03°46’28.83’’S e 38°26’36.52’’S). Aeromonas were identified in 19 (63%) samples
analyzed by plating and CFU counts. Presence/absence tests were positive for 11 (37%) of the samples
resulting in the detection of Aeromonas in a total of 23 (77%) of samples. CFU counts varied from < 10 to
1.4 x 104 CFU mL-1. From the isolated strains seven species of Aeromonas were identified: A. caviae
(29/69), A. veronii bv. sobria (13/69), A. veronii bv. veronii (8/69), A. trota (6/69), A. media (5/69), A.
sobria (4/69) and A. hydrophila and Aeromonas sp. (2/69). Of the 38 strains tested, 23 (60%) showed
resistance to at least one of the eight antimicrobials. Multiple resistance to antibiotics was observed in A.
caviae, A. media, A. sóbria and A. veronii bv. sobria. Aeromonas caviae showed the highest multiple
resistance, being resistant to four antibiotics. The presence of those microorganisms may contribute to the
occurrence of gastroenteritis, mainly in children, since they are considered opportunists.
