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[Effectiveness evaluation of deltamethrin (K-othrin 50FW), in low doses, in the control of triatominae in Sao Sebastiao do Umbuzeiro, Paraiba].

We tested deltamethrin (K-Othrine 50 FW) in the control of triatomine bugs, in an semi arid area with about 56.6% of houses bug infested. We used in 402 Domiciliary Units, 125, 75, 60 or 50 ml per pump of 10 liters, equivalent, if applied on 250 m2, to 25, 15, 12 and 10 mg/m2. The invasion, colonization and cumulative indices in the houses and the positivity index in shelters near houses were very low and similar in the four groups during the 15 months of evaluation, indicating that lower doses could replace 25 mg/m2. T. infestans, followed by T. pseudomaculata, predominated in and near the houses, after spraying.

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[Epidemiologic study of the sources of blood feeding of the triatominae of the Aroeira farm (Catolé do Rocha, Paraìba) and neighboring localities].

We have analysed the blood feeding sources of 94 triatomine bugs (51 T. brasiliensis, 42 T. pseudomaculata and one R. neglectus) from Fazenda Aroeira, in Catolé do Rocha Municipality, Paraíba State, and four neighbouring localities. The positivity for marsupial, man and bird blood were, respectively, 39.7, 6.2 and 23.0%. Three insects from Fazenda Aroeira were positive both for T. cruzi and marsupial blood while only one of the three was positive for another mammal. Marsupials are the most important source of T. cruzi for the insects of the area, which have little contact with man.

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[Behavior of Trypanosoma cruzi strains after passage in different triatominae species].

To study the influence of the intermediate host stage on the course of mouse infection, Trypanosoma cruzi belonging to the Peruvian (Type I), 12 SF (Type II) and Colombian (Type III) strains were passaged through either Rhodnius prolixus, Panstrongylus megistus or Triatoma infestans. T. cruzi metacyclic forms (dose 10(4)) from the different strains were obtained from each bug and inoculated into 8-10 gm mice. Comparison was made in mice inoculated with blood forms. Parasitaemia curves were plotted in the peripheral blood for each strain, reaching more elevated peaks with Peruvian strain parasites from P. megistus and R. prolixus, 12 SF strain from P. megistus and Colombian strain from R. prolixus. Tissue tropism and histopathological patterns were those usually seen in mice infected with each respective strain type. Peruvian virulence was the same for all groups. Slender forms predominate among mice inoculated with metacyclic forms of Colombian and 12 SF strains, probably an adaptative parasite change related to the intermediate host.

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[Xenodiagnosis in Chagas disease: influence of the triatominae sex].

We evaluated, comparatively, the performance of female and male Triatoma infestans in the 5th instar of development, in xenodiagnosis for Chagas' disease. Xenodiagnosis were done in 40 patients with chronic infectans. For each diagnosis 20 nymphs female and 20 nymphs males were used, which were weighed immediately before and after the meal. Intestinal contents were examined about 20, 30, 60 and 90 days after the xenodiagnosis application. The females and males ingested the mean of 230 and 210 mg of blood, respectively. The results revealed positivity of 15 (37.5%) out of 40 xenodiagnosis, but any of the positive tests show 100% of the nymphs, female and/or male infected by T. cruzi. The females ingested significantly more blood than the males; this is coincidental with the higher female positivation to T. cruzi here observed. Our results suggest that the female nymphs seem able to increase the sensibility of the xenodiagnosis for chronic patients with Chagas' disease being necessary further studies are necessary to confirm this hypothesis.

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