[Household infestation by triatomines and human seroprevalence in Empedrado Department, Corrientes, Argentina] / Infestación domiciliaria por triatominos y seroprevalencia humana en el Departamento Empedrado, Corrientes, Argentina.

Domestic and peridomestic triatomine colonization, T. infestans infection rate and human seropositives to Trypanosoma cruzi in rural areas of Empedrado Department, Corrientes, Argentina, were carried out. Methods used in order to search the triatomines, to determine them systematically, to obtain their infection rates and the human seropositives, were the same applied in a previous report. From 100 households characterized, 53.0% had mud walls, laminated zinc or cardboard combined with other elements were used in 37.5% of the roofs, and 83.0% had earthen floors. Presence of domestic animais sleeping inside houses was detected in 91.0% of human dwellings. Domestic infestation by T. infestans was 29.0% and 1.0% by T. sordida. Other T. infestans entomological indexes recorded were: natural infection index = 23, colonization index = 75 and dispersion index = 54,5. T. sordida was found in 12.1% of peridomestic structures while T. infestans was detected in 2.4%. General prevalence from 298 human sera analized by Indirect Hemagglutination and Indirect Immunofluorescence Antibody Tests, was 32.2%. A high percentage of positive serology (23.7%) was found among 0-10 years old, wich represent the age group of higher transmission risk.

Infestacion domestica por Triatoma infestans y prevalencia de seropositivos al Trypanosoma cruzi en un area rural del nordeste argentino / Domestic infestation by Triatoma infestans and prevalence of seropositives to Trypanosoma cruzi in a rural population of the Northeast of Argentina

An epidemiological study was carried out from April 1991 to December 1993 to obtain a general view of T. cruzi domestic transmission in rural areas of San Miguei Department, Corrientes. From 100 analyzed households, 50.0 per cent was infested by T infestans (Klug, 1834) and 1.0 per cent by T. sordida (Stal, 1859). Domiciliary colonization by T. sordida is reported for first time in Corrientes province. T. cruzi infection of T. infestans was 23.1 per cent. Indirect hemagglutination and indirect immunofluorescence antibody tests were used for detection of anti T. cruzi antibodies in 388 human sera, 23.4 per cent showed serological reactivity. An important high rate (12.9 per cent) was observed in the age group of higher transmission risk. Seropositives percentages increased with age and reached 50.0 per cent in 31-40 years old group. Domestic infestation by T. infestans, seropositive human prevalence to T. cruzi and householders precarious life conditions prove that this endemic disease is still a problem in the studied area.

[Domestic infestation by Triatoma infestans and prevalence of Trypanosoma cruzi seropositives in a rural area of the Argentinian northeast]. / Infestacion domestica por Triatoma infestans y prevalencia de seropositivos al Trypanosoma cruzi en un area rural del nordeste argentino.

An epidemiological study was carried out from April 1991 to December 1993 to obtain a general view of T. cruzi domestic transmission in rural areas of San Miguei Department, Corrientes. From 100 analyzed households, 50.0% was infested by T infestans (Klug, 1834) and 1.0% by T. sordida (Stal, 1859). Domiciliary colonization by T. sordida is reported for first time in Corrientes province. T. cruzi infection of T. infestans was 23.1%. Indirect hemagglutination and indirect immunofluorescence antibody tests were used for detection of anti T. cruzi antibodies in 388 human sera, 23.4% showed serological reactivity. An important high rate (12.9%) was observed in the age group of higher transmission risk. Seropositives percentages increased with age and reached 50.0% in 31-40 years old group. Domestic infestation by T. infestans, seropositive human prevalence to T. cruzi and householders precarious life conditions prove that this endemic disease is still a problem in the studied area.

[Triatoma infestation in the San Luis del Palmar Department of Corrientes Province, Argentina]. / Triatomismo del Departamento San Luis del Palmar de la provincia de Corrientes, Argentina.

The purpose of this study was to determine domestic and peridomestic infestation of Triatominae, Trypanosoma cruzi infection rates, and the prevalence of human seroreactivity in rural areas of the Department of San Luis del Palmar, Corrientes, Argentina (Fig. 1). The study took place from April 1986 to May 1989. The Department of San Luis del Palmar covers an area of 2551 km2 and is part of the Neotropical biogeographic region, Chacoan Dominion and Province. The climate is of the subhumid type. The mean annual temperature is 21.6 degrees C. Some localities were chosen because of the presence of triatominae. Households were carefully examined and classified according to their building materials. A 0.2% solution of tetrametrine was sprayed in all possible hiding places to dislodge bugs, which were collected by capture/hour/man methods. A survey to determine the socioeconomical, sanitary, and cultural conditions of house-dwellers was carried out. The same method was used to examine peridomiciles and total demolition was carried out in the positive ones. Fecal examination was carried out to verify the presence of T. cruzi in collected insects and observed at 400X. Human blood was obtained through venipuncture. The serum was kept in a freezer until examined. Serologic studies included indirect hemagglutination test (IHAT) and indirect immunofluorescence antibody test (IFAT). Positive titer for IHAT and IFAT was 1/64. Seroreactives were those that had two positive assays. The whole data obtained was analyzed by chi 2 tests. From one hundred households studied, 80% belonged to huts and 20% to houses. Mud walls were predominant in huts while brick walls were predominant in houses.(ABSTRACT TRUNCATED AT 250 WORDS)

Triatomismo del Departamento San Luis del Palmar de la provincia de Corrientes, Argentina. / [Triatoma infestation in the San Luis del Palmar Department of Corrientes Province, Argentina]

The purpose of this study was to determine domestic and peridomestic infestation of Triatominae, Trypanosoma cruzi infection rates, and the prevalence of human seroreactivity in rural areas of the Department of San Luis del Palmar, Corrientes, Argentina (Fig. 1). The study took place from April 1986 to May 1989. The Department of San Luis del Palmar covers an area of 2551 km2 and is part of the Neotropical biogeographic region, Chacoan Dominion and Province. The climate is of the subhumid type. The mean annual temperature is 21.6 degrees C. Some localities were chosen because of the presence of triatominae. Households were carefully examined and classified according to their building materials. A 0.2

solution of tetrametrine was sprayed in all possible hiding places to dislodge bugs, which were collected by capture/hour/man methods. A survey to determine the socioeconomical, sanitary, and cultural conditions of house-dwellers was carried out. The same method was used to examine peridomiciles and total demolition was carried out in the positive ones. Fecal examination was carried out to verify the presence of T. cruzi in collected insects and observed at 400X. Human blood was obtained through venipuncture. The serum was kept in a freezer until examined. Serologic studies included indirect hemagglutination test (IHAT) and indirect immunofluorescence antibody test (IFAT). Positive titer for IHAT and IFAT was 1/64. Seroreactives were those that had two positive assays. The whole data obtained was analyzed by chi 2 tests. From one hundred households studied, 80

belonged to huts and 20

to houses. Mud walls were predominant in huts while brick walls were predominant in houses.(ABSTRACT TRUNCATED AT 250 WORDS)

Triatomismo del Departamento San Luis del Palmar de la provincia de Corrientes, Argentina. / [Triatoma infestation in the San Luis del Palmar Department of Corrientes Province, Argentina]

The purpose of this study was to determine domestic and peridomestic infestation of Triatominae, Trypanosoma cruzi infection rates, and the prevalence of human seroreactivity in rural areas of the Department of San Luis del Palmar, Corrientes, Argentina (Fig. 1). The study took place from April 1986 to May 1989. The Department of San Luis del Palmar covers an area of 2551 km2 and is part of the Neotropical biogeographic region, Chacoan Dominion and Province. The climate is of the subhumid type. The mean annual temperature is 21.6 degrees C. Some localities were chosen because of the presence of triatominae. Households were carefully examined and classified according to their building materials. A 0.2

solution of tetrametrine was sprayed in all possible hiding places to dislodge bugs, which were collected by capture/hour/man methods. A survey to determine the socioeconomical, sanitary, and cultural conditions of house-dwellers was carried out. The same method was used to examine peridomiciles and total demolition was carried out in the positive ones. Fecal examination was carried out to verify the presence of T. cruzi in collected insects and observed at 400X. Human blood was obtained through venipuncture. The serum was kept in a freezer until examined. Serologic studies included indirect hemagglutination test (IHAT) and indirect immunofluorescence antibody test (IFAT). Positive titer for IHAT and IFAT was 1/64. Seroreactives were those that had two positive assays. The whole data obtained was analyzed by chi 2 tests. From one hundred households studied, 80

belonged to huts and 20

to houses. Mud walls were predominant in huts while brick walls were predominant in houses.(ABSTRACT TRUNCATED AT 250 WORDS)