helicobacter pylori infection and serum leptin, obestatin, and ghrelin levels in mexican schoolchildren.backgroundthere is little information about the possible role of helicobacter pylori infection on appetite-regulating peptides in children. this study evaluated the association between h. pylori infection and serum levels of ghrelin, leptin, and obestatin in schoolchildren.methodsone hundred seventy-eight schoolchildren, students at boarding schools in mexico city, participated. h. pylori infection status was determined every 6 months for 1 year by a breath test using (13)c-urea; schoolchildren ...201728422951
[frequency of gastric lymphoma at 6 hospitals in mexico city].gastric lymphoma has been traditionally considered a rare neoplasm that constitutes 1-5% of malignant gastric tumors. two studies performed in mexico in 1960 and 1966 found that only 1.9% and 1% of gastric neoplasms were lymphomas. nevertheless, some studies made in the u.s. and in some european countries in recept decades have revealed an increase in the frequency of this neoplasm. a recent study made at two national health institutes in mexico city (instituto nacional de cancerología and insti ...200111917443
helicobacter pylori and other enteric bacteria in freshwater environments in mexico city.helicobacter pylori infection is common in the mexican population; however, sources, routes, and risk factors for infection as well as mode of transmission remain unclear.200111578764
helicobacter pylori in water systems for human use in mexico city.helicobacter pylori infection is associated with peptic ulcers and gastric cancer in humans. transmission of h. pylori is still not certain with some epidemiological data suggesting water as a possible transmission route. the objective of this study was to detect h. pylori 16s rrna gene in five water systems in the mexico city area. samples were taken between 1997 and 2000 from extraction wells (system 1), from dams used as water sources, both pre- and post-treatment (systems 2 and 3), treated w ...200111464777
microbiological implications of periurban agriculture and water reuse in mexico city.recycled treated or untreated wastewater represents an important health challenge in developing countries due to potential water related microbiological exposure. our aim was to assess water quality and health implications in a mexico city periurban agricultural area.200818509453
effect of eradication of helicobacter pylori and iron supplementation on the iron status of children with iron deficiency.we undertook this study to evaluate the effect of helicobacter pylori eradication and iron supplementation on the iron nutritional status in children with iron deficiency.201020430253
high rates of recurrence and of transient reinfections of helicobacter pylori in a population with high prevalence of infection.little is known concerning the magnitude of reinfection versus recrudescence of helicobacter pylori (h. pylori) infection after eradication treatment. the aims of this study were to determine the magnitude of h. pylori reinfection versus recrudescence, and to identify possible risk factors for reinfection.200314638339
[helicobacter pylori infection and gastric cancer in mexico. a challenge for prevention and population control].the international agency for research on cancer (iarc) of the who has recognized a cause-effect relationship between helicobacter pylori (hp) infection and gastric cancer of such magnitude that the presence of this infection increases the risk of gastric cancer approximately four times. gastric cancer is currently the second cause of mortality due to malignant neoplasms in mexico city. this article explores the association between hp infection and gastric cancer incidence through an epidemiologi ...19979190649
protective effect of yoghurt consumption on helicobacter pylori seropositivity in a mexican population.the aim of the study was to determine the relationship between fermented and unfermented dairy product consumption and helicobacter pylori seropositivity in a mexican population.200717381881
longitudinal study of microbial diversity and seasonality in the mexico city metropolitan area water supply the mexico city metropolitan area (mcma), 70% of the water for 18 million inhabitants is derived from the basin of mexico regional aquifer. to provide an overview of the quality of the groundwater, a longitudinal study was conducted, in which 30 sites were randomly selected from 1,575 registered extraction wells. samples were taken before and after chlorine disinfection during both the rainy and dry seasons (2000-2001). microbiological parameters (total coliforms, fecal coliforms, streptococc ...200516151096
bacteria and disinfection byproducts in water from southern mexico city.disinfection byproducts and microorganisms present in drinking water may have deleterious effects on human health. the authors examined bacterial indicators (enterobacteria and helicobacter pylori [h. pylori]), physicochemical parameters, and trihalomethane (thm) levels to conduct a water quality evaluation in mexico city, where little is known about disinfection byproducts and microbial counts. analyses were performed by standard membrane filtration for the enumeration of total coliforms, fecal ...200314655904
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