Isolation of Salmonella enterica and serologic reactivity to Leptospira interrogans in opossums (Didelphis virginiana) from Yucatán, México.

The presence of Salmonella enterica and serologic evidence of infection by Leptospira interrogans, were detected in the opossum Didelphis virginiana in a semi-urban locality of the Yucatán State, México. Ninety-one opossums were captured during the period April 1996 and May 1998. From a total of 17 feces samples, four Salmonella enterica subsp.

Asymptomatic salmonellosis among children in day-care centers in Mérida, Yucatan, Mexico.

Background: Child day-care centers (DCC) have become common in many lower and middle income countries, presenting new problems that may differ from those of DCC in more developed countries. Diarrhea is a common problem in DCC in the United States, but information on the prevalence of diarrhea or specific enteropathogens among children in DCC in tropical and developing countries is limited.

Methods: Because of preliminary data from newborns and DCC attendees in Mérida, Mexico, with high rates of Salmonella infection, we conducted a 12-month longitudinal surveillance study of enteropathogens in two Mérida DCC.

Four biochemical tests for identification of probable enteroinvasive Escherichia coli strains.

Enteroinvasive Escherichia coli (EIEC) share important features with Shigella spp., but EIEC strains are difficult to identify because their biochemical reactions are variable, and Sereny tests or other biological and molecular assays are expensive or hard to perform. The aim of this work was to detect probable enteroinvasive E.

Frequency of adhesive factors and enterotoxins in strains of Escherichia coli isolated from piglets with diarrhea.

Neonatal colibacillosis is one of the most prevalent illnesses in pig farms. In order to examine the frequency of adherence factors and the production of enterotoxins in strains of E. coli, we collected stool specimens from 500 piglets between 1 and 10 days of age with diarrhea, including piglets from several different farms on the periphery of Mérida, Yucatán.

[Bacteriological quality of drinking water in the City of Merida, Mexico].

With the aim of knowing the microbiological quality of drinking water in Merida, Yucatan, 383 paired samples of drinking water (two per house) were studied. Three hundred sixty four (95%) city water system samples and 283 (73.89%) tap water samples met the microbiological standards for drinking water.

Frequency of enterotoxigenic Escherichia coli in infants during the first three months of life.

To know at what age infants begin to excrete enterotoxigenic Escherichia coli from feces, we studied 30 infants belonging to low socioeconomic status during the first 3 months of life, taking 11 samples of feces from each infant, beginning at the day of birth. We detected LT and ST enterotoxins of E. coli using ELISA test.

[Prevalence of enteropathogens in children with liquid diarrhea].

Between january 1 and october 31, 1991 148 samples of feces corresponding to the same number of children with acute diarrhea, aged 0-2 years, admitted to Hospital O'Horan of the Secretariat of Health in the city of Merida, Yucatan, Mexico, were studied. Stools from 105 (70.9%) patients were described as watery diarrhea; from these samples at least one enteric pathogen was detected in 49 (46.

[Prevalence of enteropathogenic bacteria in children with acute bloody diarrhea].

Between January to October 1991, were studied 148 samples of feces corresponding to the same number of children with acute diarrhea. In 41 (27.7%) samples, were found macroscopic or microscopic blood.

[Excretion of Salmonella in feces during the 1st 3 months of life].

30 children were followed up during their first three months of life, in order to determinate the moment for Salmonella excretion through feces. Five samples were taken during first month, and 3 samples in the next 2 months each. S.