Risk factors for low birth weight according to the multiple logistic regression model. A retrospective cohort study in José María Morelos municipality, Quintana Roo, Mexico.

Introduction: Low birth weight has been an enigma for science over time. There have been many researches on its causes and its effects. Low birth weight is an indicator that predicts the probability of a child surviving.

[Prevalence of clinically important species of the genus Vibrio in catered seafood of city and port of Progreso de Castro, Yucatan, Mexico].

Introduction: Species of the genus Vibrio are invariably gram-negative bacilli, between 2 and 3 µm long and curved in shape, sometimes equipped with a single polar flagellum that allows high mobility. They tolerate well alkaline media and high-salt concentrations in their environment. They do not form spores, are oxidase-positive and facultative anaerobes.

[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.