INCIDENCIA Y VIABILIDAD DE Cryptosporidium parvum EN EL AGUA POTABLE DE CIUDAD OBREGÓN, SONORA, MÉXICO
Cryptosporidium parvum is a protozoan parasite, which is frequently associated with Giardia lamblia. It causes diarrhea which is more severe in children, elderly and immunocompromissed patients. Water is a very important parasite carrier. Oocysts are very resistant to the common potabilization proce...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | México |
| Recursos: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Revista Internacional de Contaminación Ambiental |
| Idioma: | español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/25138 |
| Acesso em linha: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/25138 |
| Access Level: | acceso abierto |
| Palavra-chave: | oocysts Cryptosporidium water potabilization ooquistes agua potabilización |
| Resumo: | Cryptosporidium parvum is a protozoan parasite, which is frequently associated with Giardia lamblia. It causes diarrhea which is more severe in children, elderly and immunocompromissed patients. Water is a very important parasite carrier. Oocysts are very resistant to the common potabilization procedures and resist concentrations up to 80 mg/L of free-chlorine. C. parvum was reported as pathogen in 1976, since then, many outbreaks have been reported overall USA and developed countries; however, in undeveloped countries the information is scarce. In this investigation, samples of 1000 liters were filtered in the city of Obregon, Sonora. Afterwards, the filters were transported on ice to the Microbiology laboratory of the Research Center. The procedure involved a elution, flotation and clarification of the samples, in order to recover the parasites. A second filtration was made with a a nitrocellulose membrane where the monoclonal antibodies were added and they were observed with an epifluorescence microscope. Efficiency test was performed at the beginning of the study, which gave a 59 % of recovery. Oocysts were found in 69 % of the samples with an average of 4.75 oocysts/1000 L. Physicochemical parameters were determinated: shown pH 7.39, free chlorine 0.96, turbidity 1.14 NTU, temperature 29.9ºC, chloride 17.5 ppm. Correlation analyses wer made among total and viables oocysts and each of the physicochemical parameters. Temperature had significative relation with total oocysts. The results have shown that potable water could be a public health risk. |
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