| seroprevalence of human trypanosoma cruzi infection in diferent geografic zones of chiapas, mexico. | a serologic survey was carried out in four different geographic zones of chiapas, mexico. a total of 1,333 samples were collected from residents of thirteen communities located on the coast, central mountain, lacandon forest and a zone called mesochiapas. one hundred and fifty one seropositive individuals (11.3%) were identified. human trypanosoma cruzi infection was influenced by geography. in the lacandon forest and central mountains there was a higher seroprevalence 32.1 and 13.8% respectivel ... | 2001 | 11600911 |
| activity and residual effect of two formulations of lambdacyhalothrin sprayed on palm leaves to rhodnius prolixus. | the insecticidal activity and residual effect of two formulations of lambdacyhalothrin were evaluated with rhodnius prolixus; laboratory and field tests were conducted in the state of chiapas, mexico. the results indicate that the lethal concentrations of the active ingredient of sc (lc50 = 2.37 and lc90 = 8.5 mg, a.i./m2) were 4-8 times than those with the insecticide wp applied on r. prolixus bugs in palm leaves, a common building material for thatched roofs. other investigators in south ameri ... | 2002 | 12048565 |