Resumen

SEPULVEDA MONTES, Adán et al. Listeria monocytogenes como bioindicador sanitario para el control ambiental de las aguas incorporadas a los embalses. Rev Cubana Hig Epidemiol [online]. 2002, vol.40, n.3, pp. 242-253. ISSN 1561-3003.

The present study is an epidemiologic environmental trial aimed at isolating and identifying Listeria monocytogenes from dammed up waters. It was conducted at the lagoon of Zapotlán, which is an important tourist resort in the southern region of the state of Jalisco. It also provides neighboring cities and populations with fish. Moore's pledget was used to isolate Listeria spp. from the samples obtained in 3 canals with sewage coming from 2 nearby municipalities. Pledgets had 2 exposure times (1 h and 24 h). A total of 60 samples were taken from September 1997, to February 1998. The 2 exposure times were considered in each sample. Of the 60 studied samples, 42 (70 %) were positive for Listeria ssp. and 40 (66.6 %) for Listeria monocytogenes. The latter was the most frequently found with 133 of the 150 isolated strains. It is obvious that the species are widely distributed in the zone and may disseminate themselves very easily in the region and in the country. Though the results do not show significant differences for the 2 exposure times, they suggest that when the pledget is exposed for 24 hours there is a higher probability of attaining isolation than when it is exposed during 1 hour.

Palabras clave : LISTERIA MONOCYTOGENES [isolation & purification]; LAKES AND IMPOUNDINGS POLLUTION; ENVIRONMENTAL PROTECTION; SEWAGE; ENVIRONMENTAL IMPACT; RISK ASSESSMENT; EPIDEMIOLOGIC SURVEILLANCE; MEXICO.