Strongyloides ferreirai sp.n. (Nematoda, Rhabdiasoidea) parasito do roedor Kerodon rupestris (Wied.) no Brasil

É descrita uma nova espécie de nematóide do gênero Strongyloides Grassi, 1879, Strongyloides ferreirai sp.n. parasita do instestino delgado de Kerodon rupestris (Wied.) proveniente de Floriano Peixoto, Estado do Piauí. Esta é a primeira referência deste gênero parasitando roedor caviideo no Brasil.

Activación de celulas supresoras de la respuesta de hipersensibilidad tardía en ratones BALB/c infectados o vacunados con Leishmania mexicana pifanoi

Los ratones BALB/c inmunizados SC con promastigotes no viables de Leishmania mexicana pifanoi, desarrollaron respuestas de hipersensibilidad tardia (RHT) contra el parásito. En contraposición, los ratones BALB/c infectados crónicamente con L.m. pifanoi y aquellos inmunizados IV con una dosis supraóptima de parásitos muertos, mostraron inhibición de la RHT. La supresión de la RHT en los animales infectados, estuvo precedida por un estado transitorio de inmunidad celular, manifestado durante la fase inicial del desarrollo de las lesiones (4-12 semanas). La inhibición de la RHT observada en los animales infectados o inmunizados con dosis supraóptimas, fue causada por un mecanismo activo, transferible a receptores singénicos a través de las células esplénicas de los donantes suprimidos. La población de células supresoras fue no adherente a "nylon", sensible al tratamiento con un suero anti-timocitos de ratón y C', y de acción específica sobre la RHT contra antígenos leishmánicos. Se propone que la ocurrencia de células T supresoras de la RHT en los animales infectados crónicamente o inmunizados con dosis supraóptimas, es causada por el exceso de carga antigénica. Esta última, en el caso de los animales infectados, secundaria a una falla primaria en el control inmunológico de la población parasitaria.

Lutzomyia gasparviannai Martins, Godoy & Silva, 1962, probable vector of Leishmania mexicana ssp. in Viana municipality, Espírito Santo State, Brazil

Dos flebótomos atraídos pelo Proechimys iheringi numa área onde esse roedor foi achado naturalmente infectado por Leishmania mexicana ssp., 98,1% foram Lutzomyia gasparviannai, o que sugere que essa espécie não antropofílica seja o transmissor entre os roedores mas não habitualmente ao homem.

Interleukin- 2 production during murine infection by Leishmania mexicana amazonensis

Highly susceptible BALB/c mice, resistant C57B1/6 and their F1 progeny (BDF1) were infected subcutaneously in the foot pad with Leishmania mexicana amazonenesis. At various times after infection, spleen or draining popliteal lymph node cells were assayed for their capacity to generate Interleukin-2 (I1-2) by Concanavalin A (ConA) stimulation. In both BALB/c and C57B1/6 strains there was a transient increase in their capacity to produce I1-2, from the 3rd to the 10th week post-infection. Return to pre-infection levels ocurred between 13th to 16th week post-infection in all three strains. BALB/c mice always produced higher titers of 11-2 than C57B1/6, but such differences were statistically significant only at 3 and 10 weeks post-infection. BDF1 mice had titers similar to those observed in BALB/c mice. I1-2 production by ConA-stimulated lymph node cells was lower as compared to the spleen, but with a similar pattern among the three mice strains. Our data show that susceptibility to infection by l. mexicana amazonenesis is not associated with deficient ConA-stimulated I1-2 production.

Saccocoelioides godoyi n.sp. (Haploporidae) and other trematodes parasites of fishes from the Guaiba estuary, RS, Brazil

One hundred and fourteen specimens of eleven different species of freshwater fishes from the Guaiba estuary, were examined for digenetic flukes. Saccocoelioides godoyi n.sp. proposed herein, is closest to S. magniovatus and to S. szidati; S. magniovatus is much smaller with comparably larger eggs and S. szidati has larger hermaphroditic sac and considerably larger testis. Creptotrema creptotrema is referred to a new host; Acanthostomum gnerii, Crepidostomum platense, Eocreadium intermedium (immature form), Parspina argentinensis and Zonocotyle bicaecata are reported. This paper confirms the similatary between the parasites of freshwater fishes from Argentina and Brazil. Measurements and original figures of all species are given.

Bolivian phlebotomines. II Psychodopygus Yucumensis n.sp., a new man-biting phlebotomine sandfly from subandean region (Diptera, Psychodidae)

Psychodopygus yucumensis n.sp., a new species of Phlebotomine sandfly belonging in genus Psychodopygus mang., is described from specimens collected from human bait, in Beni dept., Bolivia. The male is characteristic of the series panamensis, but the female, closely related to P. carrerai carrerai, can be confused with this species ("cryptic species"). Isozyme characterization can determine any specimen of either species, while morphometric analysis shows statistical differences between the two species. P. yucumensis is strongly anthropophilic. A Leishmania braziliensis braziliensis stock was isolated from this new species, indicating that it is one of the vectors of mucocutaneous Leishmaniasis in the lowland subandean area.

Experimental infection of Lutzomyia longipalpis fed on a patient with cutaneous leishmaniasis due to Leishmania mexicana amazonensis

The authors were able to infect phlebotomine sandflies on a human case of American Cutaneous Leishmaniasis by feeding females of Lutzomyia longipalpis on a patient with a lesion due to Leishmania mexicana amazonensis.

Gorgorhynchus Trachinotus n.sp. and new host records for Dollfusentis Chandleri Golvan, 1969 (Paleacanthocephala, Echinorhynchoidea)

Gorgorhynchus trachinotus recovered from the intestine of trachinotus goodei Jordan & Evermann, 1896 is proposed as a new species and three new host records are reported for Dollfusentis chandleri Golvan, 1969.

The susceptibility of wild caught sand flies to infection by a subspecies of Leishmania mexicana isolated from proechimys iheringi denigratus (Rodentia, echimyidae)

Several species of wild caught sand flies were collected in the same site where a subspecies of leishmania mexicana was isolated from the rodent Proechimys iheringi denigratus. The absence of natural infection in these sand flies permitted us to test, with relative assurance, the susceptibility of wild caught females to infection by this parasite. the success obtained in these experimental infections suggest that one or more of the sand fly species encountered in high numbers in the same site where the infected rodents were captured may be the vector(s) of this subspecies of l. mexicana.

Dermatophagoides Deanei sp.n., nova espécie de acaro piroglifídeo encontrada no Brasil, em poeira domiciliar

Uma nova espécie de ácaro, Dermatophagoides deanei, foi encontrada em amostras de poeira omiciliar de várias capitais do Brasil.

Descrição de uma nova espécie do subgênero Helcocyrtomyia, Lutzomyia Pusilla sp. n. (Diptera, Psychodidae, Phlebotominae)

Estudando o material de Helcocyrtomyia depositado na coleção de flebotomíneos do Centro de Pesquisas René rachou, os autores verificaram a ocorrência de uma nova espécie, Lutzomyia pusilla sp. n., que até o momento era confundida com lutzomyia peresi (Mangabeira, 1942).

Henneguya intracornea n.sp. (Myxozoa: Myxosporea) parasita do olho do lambari, Astyanax Scabripinnis (Jenyns, 1842) (Osteichthyes, Characidae)

Descreve-se um novo mixosporídeo - Henneguya intracornea n.sp - parasita da córnea de peixe de água doce, Astyanax scabripinnis (Jenyns, 1842) da região de Campinas, Sp. As sucessivas fases evolutivas são descritas. Assinalam-se os caracteres morfológicos e biológicos que distinguem H. intracornea n.sp. das demais espécies do gênero. Destaca-se o parasitismo exclusivo da córnea do peixe parasitado e suas características morfológicas, com ênfase para sua típica cápsula polar, com a forma de garrafa e para os dois processos caudais, desiguais no comprimento.

Phlébotomes de Bolive: IV. Lutzomyia (Trichophoromyia) beniensis, n.sp. (Diptera, Psychodidae)

Les auteurs décrivent le mâle et la femelle de Lutzomyia (Trichophoromyia) beniensis n.sp., capturés dans le galerie forestiére du Rio Beni (Département du Beni). L'espèce n'est pas anthropophile mais aurait des appétences omithophiles.

Descrição de uma nova espécie do subgênero Helcocyrtomyia, Lutzomyia capixaba sp.n. (Diptera, Psychodidae, Phlebotominae)

Os autores descrevem uma nova espécie, Lutzomyia capixaba sp.n., pertencente ao grupo dos flebotomíneos de cinco espinhos do subgênero Helcocyrtomyia Barreto, 1962.