Cat liver fluke, Platynosomum concinnum, in Hawaii.
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ABSTRACT: Platynosomiasis is a parasitic infection reported in non-human primates, including marmosets, and is frequently difficult to diagnose. In this study, the Kato-Katz method and the spontaneous sedimentation method were evaluated for their usefulness in identifying "Platynosomum" eggs in fecal samples from "Callithrix penicillata" that naturally harbor "Platynosomum illiciens". Spontaneous sedimentation allowed the diagnosis of 41.7% (5/12) and 66.7% (8/12) of infected marmosets from one and three slides, respectively, prepared from the same fecal sample. The examination of a single Kato‑Katz thick smear detected 83.3 (10/12) of infection cases. The analysis of feces on three different days increased the rate of diagnosis, since 75% (9/12) and 100% (12/12) of the primates with platynosomiasis were identified using serial spontaneous sedimentation (3 slides/day) and the Kato-Katz method, respectively. The mean number of "Platynosomum" eggs per gram of feces determined via the Kato-Katz method was 71.7 (8-240). The spontaneous sedimentation method when performed in series is acceptable for the diagnosis of platynosomiasis. However, the Kato-Katz method, which was here used for the first time to detect this infection, has a higher diagnostic sensitivity and the advantage that a quantitative analysis of the eggs released in the host feces is possible.Revista brasileira de parasitologia veterinaria = Brazilian journal of veterinary parasitology: Orgao Oficial do Colegio Brasileiro de Parasitologia Veterinaria 01/2015; 24(1):108-113. DOI:10.1590/S1984-29612015014 · 0.96 Impact Factor
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ABSTRACT: Platynosomum fastosum is a small hepatic trematode found in the biliary ducts and gall bladder of cats and other mammals. It is commonly found in tropical and subtropical regions. Some aspect of the life cycle of this parasite is not fully understood, however terrestrial snails, lizards and isopods are implicated as intermediate/paratenic hosts. The disease caused by P. fastosum is platynosomiais (named after the parasite) or ‘lizard poisoning’ since it is assumed that affected cats acquire the parasite by eating infected lizards. The clinical signs due to infection with P. fastosum may range from asymptomatic to progressive disease and at times death due to biliary tract obstruction and hepatic failure. Infection with this parasite should, therefore, be included in the differential diagnosis of cats with signs of hepatic diseases.Veterinary Parasitology 01/2013; 200(1-2). DOI:10.1016/j.vetpar.2013.12.016 · 2.55 Impact Factor
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ABSTRACT: The platynosomiasis, a worldwide parasitic disease with importance for domestic cat, has an etiological agent species of trematodes of the genus Platynosomum, whose complete life cycles are not yet known. The real role of lizards in the transmission of this dicrocoeliid parasite (as obligatory intermediate or paratenic host) still needs to be defined. In the present study, oval-shaped encysted metacercariae obtained from terrestrial isopods (Oniscidea sp. and Nagurus nanus) and elongated excysted metacercariae found in biliary ducts and gallbladder of lizards (Hemidactylus mabouia) in Brazil were used for morphological characterization and experimental infection of mice. Adult parasites recovered from bile ducts and liver of mice inoculated orally with metacercariae from both hosts (isopods and lizards) were identified as Platynosomum illiciens (=Platynosomum fastosum), showing that lizards are paratenic (not obligatory) hosts involved in the life cycle of this parasite. Moreover, Subulina octona is reported as the first intermediate host of P. illiciens in South America, and terrestrial isopods are presented here as new natural second intermediate hosts of the parasite. Finally, it is pointed out that high prevalence and intensity of infection of intermediate and paratenic hosts were observed. These findings on the life cycle of P. illiciens are relevant considering that they may indicate possible control measures of platynosomiasis.Parasitology Research 05/2014; 113(7). DOI:10.1007/s00436-014-3926-5 · 2.33 Impact Factor