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1.
Southeast Asian J Trop Med Public Health ; 1997 Mar; 28(1): 158-60
Artículo en Inglés | IMSEAR | ID: sea-35761

RESUMEN

Strongyloides stercoralis infection is of low prevalence in Malaysia. We report an unusual case presenting primarily with gastric symptoms. The patient was a 72 years old Chinese male admitted for progressive weight loss and abdominal bloating. Gastroscopic examination revealed mucosal prepyloric elevations in the gastric mucosa. Gastric strongyloidiasis was confirmed by the presence of adult forms, as well as ova and larval rhabditiform stages of the worm in the gastric mucosal crypts. We believe that this is the first histologically documented case of gastric strongyloidiasis in Malaysia.


Asunto(s)
Anciano , Animales , Países en Desarrollo , Mucosa Gástrica/parasitología , Gastroscopía , Humanos , Larva , Masculino , Recuento de Huevos de Parásitos , Gastropatías/patología , Estrongiloidiasis/patología
2.
Southeast Asian J Trop Med Public Health ; 1993 Jun; 24(2): 333-9
Artículo en Inglés | IMSEAR | ID: sea-35520

RESUMEN

Two groups of three rabbits each were infected with 250 cercariae of the Baling and Koyan strain of Schistosoma malayensis. Changes induced by both strains included periportal hepatocellular necrosis and fibrosis. Vascular changes such as portal phlebitis and thrombophlebitis and varying degrees of pericholangitis were also present. Amyloid deposition was noted. A comparative study of the changes induced in rabbits by S. malayensis, S. mekongi and S. japonicum showed that the hepatic lesions induced by the Baling strain of S. malayensis were similar to that induced by S. japonicum, and were more severe than that induced by S. mekongi or the Koyan strain.


Asunto(s)
Animales , Femenino , Reacción a Cuerpo Extraño/patología , Hígado/parasitología , Ratones , Necrosis , Conejos , Schistosoma/patogenicidad , Schistosoma japonicum/patogenicidad , Especificidad de la Especie , Bazo/parasitología
3.
Southeast Asian J Trop Med Public Health ; 1992 Dec; 23(4): 711-5
Artículo en Inglés | IMSEAR | ID: sea-34269

RESUMEN

Two distinct strains of Schistosoma malayensis exist in Malaysia (designated the Baling and Koyan strains). Both these strains show intraspecific variations in pathology (Greer et al, 1988). To evaluate the differences in the pulmonary pathology resulting from infections of the two different strains of Malaysian schistosome, a total of 20 experimental rabbits were infected, 10 each with cercariae of the Koyan strains. Pathological changes were studied over a period of 28 weeks. Granulomas in the lung occurring as a result of infection with the Baling strain were compared with those caused by infection with the Koyan strain. Although both strains produced parenchymatous and alveolar lesions, granulomas caused by the Baling strain of Malaysian schistosome were more numerous and larger (when comparing mean diameter as well as area of granuloma, p < 0.05). In addition, pulmonary vascular hypertensive changes were present in Baling strain infected rabbits. These comprised of pulmonary arteriolar endothelial swelling and damage, intimal elastosis and medial hypertrophy. Angiitis and pulmonary periphlebitis were also noted occasionally. In contrast, Koyan strain infection resulted in fewer and smaller granulomas. Pulmonary vascular changes were minimal.


Asunto(s)
Animales , Estudios de Casos y Controles , Femenino , Pulmón/patología , Conejos , Schistosoma/clasificación , Esquistosomiasis/patología
4.
Southeast Asian J Trop Med Public Health ; 1992 Mar; 23(1): 92-7
Artículo en Inglés | IMSEAR | ID: sea-31233

RESUMEN

Schistosoma malayensis Sp N is a putative new species of schistosome discovered in Peninsular Malaysia in 1973. This paper comprises the first report on the detailed gastrointestinal pathology present in rabbits infected with strains of the parasite. Two different strains of schistosome--the Baling and Koyan strains--from two different ecosystems were used to infect inbred rabbits and the resulting pathophysiology was studied. Our results showed that the Baling strain of S. malayensis was more virulent than the Koyan strain and produced nodular, segmental circumferential lesions and large bilharziomas measuring 1-7 cm in diameter in the distal jejunum, ileum and the ileo-caecal junction. The findings indicate that the Baling strain of S. malayensis was more pathogenic for rabbits as compared with the Koyan strain--in relation to the gross pathology of the gut and the tissue egg load. Earlier reports have shown that rabbits infected with S. japonicum induces significant intestinal lesions in rabbits (Cheever et al, 1980 a,b) but these animals are refractory to infection with S. mekongi (Byram and Lichtenberg, 1980). Our studies show that the two strains of S. malayensis adapted well in rabbits. It is also established that in rabbits, the virulence of the Baling strain of S. malayensis is greater than that of S. mekongi and approximates that of S. japonicum.


Asunto(s)
Animales , Modelos Animales de Enfermedad , Estudios de Evaluación como Asunto , Femenino , Hematócrito , Parasitosis Intestinales/patología , Hígado/parasitología , Malasia , Tamaño de los Órganos , Recuento de Huevos de Parásitos , Conejos , Schistosoma/clasificación , Esquistosomiasis/sangre , Bazo/patología
5.
Southeast Asian J Trop Med Public Health ; 1991 Dec; 22 Suppl(): 129-34
Artículo en Inglés | IMSEAR | ID: sea-34947

RESUMEN

Sarcocystis is a tissue coccidian with an obligatory two-host life cycle. The sexual generations of gametogony and sporogony occur in the lamina propria of the small intestine of definitive hosts which shed infective sporocysts in their stools and present with intestinal sarcocystosis. Asexual multiplication occurs in the skeletal and cardiac muscles of intermediate hosts which harbor Sarcocystis cysts in their muscles and present with muscular sarcocystosis. In Malaysia, Sarcocystis cysts have been reported from many domestic and wild animals, including domestic and field rats, moonrats, bandicoots, slow loris, buffalo, and monkey, and man. The known definitive hosts for some species of Sarcocystis are the domestic cat, dog and the reticulated python. Human muscular sarcocystosis in Malaysia is a zoonotic infection acquired by contamination of food or drink with sporocysts shed by definitive hosts. The cysts reported in human muscle resembled those seen in the moonrat, Echinosorex gymnurus, and the long-tailed monkey, Macaca fascicularis. While human intestinal sarcocystosis has not been reported in Malaysia so far, it can be assumed that such cases may not be infrequent in view of the occurrence of Sarcocystis cysts in meat animals, such as buffalo. The overall seroprevalence of 19.8% reported among the main racial groups in Malaysia indicates that sarcocystosis (both the intestinal and muscular forms) may be emerging as a significant food-borne zoonotic infection in the country.


Asunto(s)
Animales , Anticuerpos Antiprotozoarios/sangre , Parasitología de Alimentos , Humanos , Parasitosis Intestinales/epidemiología , Malasia/epidemiología , Enfermedades Musculares/epidemiología , Prevalencia , Sarcocystis/clasificación , Sarcocistosis/epidemiología , Zoonosis
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