Perfiles de susceptibilidad antimicrobiana en bacterias aisladas del agua de consumo en la ciudad de Riobamba, provincia de Chimborazo.

Abstract

The objective of the investigation work was studying the microbial susceptibility profiles of the isolated bacteria of drinking water in Riobamba city, Chimborazo province. The water samples were taken from six (water taps) houses of different distribution networks and from five water bottles from natural or mineral fountains. Classic biochemical tests were conducted as well as the Kirby Bauer and the antibiotical I susceptibility. It was studied through plate diffusion and with the tables according to NCCLS (Nacional Committe for Clinical Laboratory Standards); the diameter limits of the inhibition zones for the pattern strains were verified. Of the 11 studied water samples 26 isolations were obtained from which 13 pure strains were identified, of these 7 colonies of gram negative bacilli were identified to Pseudomona spp. (42,86%), Burkholderia cepacia y Ralstonia pickettii (14,29%) y Brevundimona diminuta (28,57%); 100% resistance to 10µg Ampiciline, was observed, 5 of them resistant to 10µg Gentamicine and 300µg Streptomicine (71,43%), 1 resistant to 30µg Minocicline and 10µg Meropenem (14,29%), to 5µg Ciprofloxacine and 25µg Trimetroprim-Sulfametazol have a 100% sensibility; while the 6 colonies of gram positive cocci were identified to Staphylococcus spp. (66,67%), Enterococcus and Micrococcus (16,67%), observing 100% resistance to 5µg Meticilina, 6 of them resistant to 10µg Ampiciline and 10µg Gentamicine (85,71%), 3 resistant to 25µg Trimetroprim-Sulfametoxazol (42,86%) and 2 resistant to 10µg Meropenem (28,57%), to 30µg Minocicline, 5µg Ciprofloxacine and 300µg Streptomicine possessing 100% sensibility. It is concluded that the drinking water bacteria in Riobamba city can contribute to the global problem of dissemination of the antibiotic resistance; this is why the need to extend the surveillance network to water and soil contaminants is recommended.