ABSTRACT
Objective To investigate the species and hosts of Paragonimus and its infection rate in eastern part of Zhenghe County,Fujian Province,so as to determine the local foci of Paragonimus. Methods The snails,crabs and stools of wild cats were collected for the examinations of cercariae,metacercariae and eggs of Paragonimus. The geographical and environmental conditions of the areas were also investigated. Results A total of 4 890 Pseudobythinella jianouensis snails and 1 035 Semisul?cospira liberlina snails were examined,and the cercariae of Paragonimus were only found in P. jianouensis,with an infection rate of 0.10%(5/4 890). Bottapotamon zhengheensis sp. nov. as the second intermediate host of P. skrjabini,were examined, and the infection rate was 85.29%(29/34)and the average numbers of metacercariae per crab and per gram of crab tissues were 3.85 and 0.62,respectively. Thirty?six Sinopotamun fujianensis crabs,as the second intermediate host of P. westermani,were examined,and the infection rate was 38.89%(14/36)and the average numbers of metacercariae per crab and per gram of crab tissues were 6.43 and 0.03,respectively. The eggs of Paragonimus were detected in 1 of 2 muck specimens of wild cats. Conclu?sion The data suggest that there is a focus of middle?to?high level of infection caused by P. westermani and P. skrjabini in the eastern part of Zhenghe County.
ABSTRACT
This paper gives a report on a new species of paragonimus in MT.Wuyishan,Fujian province during 1978 to 1983.All the type are deposited in the Center for Disease Control and Prevention of Fujian province.Holotype body short-oval,12.5 by 7.0mm,ratio of width to length 1:1.79.Ovary 2.0×2.13mm in size,the third class branches.Testes big,2.5 by 3.75mm(left) and 2.0 by 4.75mm(right)in size,as piece-shapy,only 2 litter branches,being much larger than the ovary.cuticular spines slender,sing in arrangement.Matacercaria obtained from the fresh-water crab,Sinopotamon fujianensis Dai et Chen,1979,measuring 395 by 410 micra,its cyst wall sing ,only 3-5 micra.Basing on the characteristic features mentioned above,This worm found by us differs fromP.westermani,P.skrijabini,P.macrorchis,P.mingqingensis and Euparagonimus cenopiosus,and can be considered as a new species of Paragonimus.
ABSTRACT
Objective]To prove that Fujian Province is also a natural focus of Pagumogonimus veocularis(Pv).[Methods]The adult worms were obtained from a cat fed with Pv metacercariae.[Results]Pv were found in Jianou,Fujian Province.All 1 873 Semisulcospira libertina showed negative.The positive rate of Tricula fujianensis and Erhaia jianouenensis were 0.10%(1/695) and 0.25%(5/2 038), respectively. The main crab host was S.fujianensis.Ps alone and mixed infection with Pv were found in the Sinopotamon ,the infection rates were 36.8%(43/117)and 20.5%(24/117), respectively. The numbers of the metacercariae were 806 and 40, respectively. A cat was infected with 12 metacercariae of Pv , eggs were found in the stool 56 days after infection,and 6 worms were found in the lungs 68 days after infection. [Conclusion]Fujian is one of the natural focus of Pv, cat is the adequate host. The fluke was identified as Pv according to the characteristics of the metacercariae.
ABSTRACT
Objective To provide the basis for the differentiation with similar species of intestinal flukes through observing the figure of Haplorchis pumilio. Methods Adults of H. pumilio were collected from the intestine of the cat which was infected with the encysted cercariae of H.pumilio for 45 days. The worms were observed after staining. Eggs and metacercariae of H.pumilio were collected and examined for their shape, size and morphological characteristics. Pseudorasbora parva, the fish host, was examined for the parasitized sites of metacercariae. Results The principal characteristics of the adults is the acetabulum degradation. There are only the genital sucker with 44-48 hamuli. The average measurement of eggs is 31.2?16.7 ?m with a smooth shell. Its aceromion is not evident. The average diameter of metacercariae is 168.5 ?m. There are squamous spines on metacercaria. The metacercariae only parasitize in the muscle between the basis of the fin and the fish body. The average measurement of metacercaria cyst is 445?95?m, with squamous spines on the body surface. Hamuli are found on the genital sucker of metacercaria cyst. Conclusion The morphological figures and parasitic sites of metacercaria, the genital sucker of the adult, and the number and form of the hamulus on the genital sucker provide basis for distinguishing H. pumilio from other intestinal flukes.
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Objective To investigate Paragonimus westermani infection in the intermediate hosts and animal reservoivs in Jiangxi Province. \ Methods\ Two forest farms in Jingan and Wanzai Counties and one town in Yushan County of Jiangxi Province were selected as pilots for epidemiological and retrospective survey. The intermediate hosts (snails, crabs) and reservoir hosts(cat, dog, civet cat, wildcat, etc.) were collected and examined. Data on the changes of ecological environment and people's behaviors were also collected. \ Results \ The average infection rate in Semisulcospira libertina and Sinopotamon spp. was 0^21% and 54^3% respectively, and that of reservoir hosts was 5^6%. Compared with those in 20 years ago, the infection rate in Sinopotamon spp. decreased considerably. \{Conclusion\}\ The three areas are still endemic for P.westermani with lower prevalence than before possibly due to the change of ecological environment.
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Objective To make etiological and epidemiological investigation on the infection of Angiostrongylus canto-nensis in 8 pupils in Changle City. Methods (1) CSF of patients was examined with the conventional method to detect pathogens and eosinophiles. (2) The fecal samples of wild rodents were collected from the spot and examined microscopically to discover the first stage larvae of A. cantonensis. (3) Snails (Pila gigas) were collected in the spot. The smashed head tissue was examined for the third stage larvae of A. cantonensis. (4) The patient's clinical symptoms and physical signs were recorded with an emphasis on central nervous system. Results (1) Two larvae of the third stage of A. cantonensis were found in CSF of one patient. Eosinophiles occupied 68% of the cell number in average (ranged from 47% to 83%) in CSF of the 8 patients. (2) The infection rate of the first stage larvae of A. cantonensis was 39.3% (44/112) in feces of the rodents. (3) The infection rate of the third stage larvae of A. cantonensis was 40. 0% (82/205) in the snails. (4) Major clinical manifestations in the 8 patients included: severe headache(8/8), dizziness(8/8), nausea(8/8), vomiting(8/8), lethargy(7/8), lower limb hypody-namia(7/8). Conclusion The confirmation of severe infection of A. cantonensis in 8 child patients demonstrated that a natural nidus of angiostrongyliasis is present in Chengle City.