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PubMed1992

[Presence of intestinal parasites in vegetables sold in the metropolitan region of São Paulo, SP, Brazil. I--Search of helminths].

Vegetables in natura, commercially traded in the metropolitan area of S. Paulo, were analysed by the appropriate methodology with a view to discovering an identifying the paths of transmission of enteroparasites of medical interest. The vegetables under study consisted of 50 samples of each variety listed below: lettuce (Lactuca sativa)-oily leaves and crisphead varieties, endive (Chicorium sp) and water-cress (Nasturtium Officinale). Results showed high rates of contamination in all the vegetable varieties analysed. However, the water-cress was that which presented the highest frequencies of enteroparasites. The endive presented middle values ranking, in general, between the lettuces and the water-cress. Though high, the average number of helminth eggs and larvae obtained per 100 gr. of sample did not present statistically significant differences as between the four vegetable varieties studied. A great variety of helminths and protozoans such as occur frequently in the resident population of the metropolitan area of S. Paulo, were observed in the samples. However, the most frequent were: hookworms and Ascaris sp. Eggs of Toxocara sp, Fasciola sp and Trichostrongylidae were also recovered from the samples thus corroborating the occurrence of vegetables contamination with faeces of domestic animals. In view of the results obtained, the importance of these kinds of food in the transmission of enteroparasites is stressed, as well as the need for actions which improve the sanitary conditions of these products.

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PubMed1993

Intestinal parasites of cats purchased in Seoul.

Fecal samples of cats purchased in Seoul were examined for helminth ova or protozoan oocysts from December 1987 to March 1988. Out of the 41 samples, 31 (75.6%) were positive and 60 (146.3%) were cumulative positive for parasites. The followings were identified in the samples: Eggs of Toxocara cati, Clonorchis sinensis, Metagonimus sp., Pharyngostomum cordatum, Spirometra erinacei, Taenia taeniaeformis and oocysts of Isospora sp. From nine autopsied cats, larvae of Anisakis simplex, adults of C. sinensis, M. yokogawai, P. cordatum, S. erinacei and T. taeniaeformis were identified. This is the first report on the detection of Anisakis larvae from cats in Korea. The possible role of cats as a source of human infection with each parasite was discussed.

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PubMed1999

Gastro-intestinal parasites of cattle in the communal grazing system of Botshabelo in the Free State.

Twelve Bonsmara tracer calves (aged 6-12 months) were used to monitor helminth infections in the communal farming system of Botshabelo in the Free State. One calve was slaughtered each month from December 1995 to November 1996 and processed for helminth recovery. All the calves harboured worms, but the numbers were always low. The order of prevalence of the major parasites was Trichostrongylus axei, Haemonchus placei, Cooperia punctata and Cooperia pectinata.

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PubMed2000

Ultrastructure of spermiogenesis and the spermatozoon of Sudarikovina taterae (Cestoda, Cyclophyllidea, Anoplocephalidae) intestinal parasite of Tatera gambiana (Rodentia, Gerbillidae).

The young spermatid of Sudarikovina taterae exhibits a nucleus with a partially condensed chromatin and a differentiation zone, bordered by cortical microtubules, delimited at the front by arched membranes and containing two centrioles. The latter are parallel to one another and linked together at their bases by electron-dense material. During spermiogenesis, one of the centrioles gives rise to a flagellum whereas the other disappears. Crested-like bodies lie outside the cortical microtubules and the nucleus migrates in the spermatid along the axoneme. At the end of spermiogenesis, the ring of arched membranes constricts and the old spermatid becomes detached from the residual cytoplasm. The S. taterae mature spermatozoon is filiform and tapered at both extremities. It exhibits an apical cone of electron-dense material and seven crested-like bodies 50 to 100 nm thick. The cortical microtubules run along the whole length of the spermatozoon. They are spiralized at their anterior extremities and straight over the rest of their length. The nucleus is a fine compact cord interposed between the axoneme and the cortical microtubules. The cytoplasm is slightly electron-dense in regions I and II of the gamete. In regions III, IV and V, it contains fine electron-dense granulations and patches of electron-lucent material. An electron-dense material located both between and under centrioles has not been observed before in a platyhelminth. Similarly, distinctive ultrastructural characters between centrioles and seven crested-like bodies have not been previously described in a cestode. Moreover, we report for the first time the existence of cortical microtubules spiralized only at their anterior extremities in a cestode from a mammal.

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PubMedDate not supplied

[Four new species of heligmosome nematodes, intestinal parasites of a Malyan Trichys lipura Günther; comparison with the Congolese fauna of Atherurs].

Description of four new species of Heligmosome Nematodes parasites of the gut of Trichys lipura: --Heligmonella limbooliati n. sp. has a synlophe of Heligmonella-type and a bursa related to Cordicauda. --Cordicauda trichysi n. sp. is characterized by the relatively small dorsal lobe of the bursa, numerous cuticular ridges and the origin of the 8th rib at the distal third of the dorsal rib. --C. malayensis is closely related to C. trichysi (the female of the two species are morphologically identical but the two species can be separated by the larger dorsal lobe of the bursa and the longer spicula of C. malayensis). --C. magnabursa n. sp. is separated from the other species of the genus by the peculiar morphology of the bursa and the female's tail, dorsally bent. The fauna of Trichys is compared to that of Atherurss africanus, which is parasitized by 8 coparasites species: One Heligmonella and seven Paraheligmonina. From a phyletic as well as an ecological point of view (relative abundance and species location in the gut) the two fauna seem to have evolved in a parallel way, one in Africa, one in Asia, from a single Heligmonella type Nematode, after the host's partition.

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