Update on hepatobiliary flukes: fascioliasis, opisthorchiasis and clonorchiasis.

PURPOSE OF REVIEW: Hepatobiliary flukes--Fasciola, Opisthorchis, Clonorchis- are a major public health problem in east Asia, east Europe, Africa and Latin America. The present review focuses on current knowledge of clinical, diagnostic and treatment aspects caused by hepatobiliary flukes that can be applied to current protocols in endemic areas. RECENT FINDINGS: Specific risk factors and geographic areas for these flukes have been heavily reported recently, with millions of people infected worldwide. Human cases in nonendemic areas, related to immigration and the international food trade (i.e. raw vegetables and fish), have also been reported. Diagnostic imaging changes include track-like lesions that are a characteristic feature of acute fascioliasis on computed tomography scanning of the liver. Newly available diagnostic serological tests may detect early infection and, therefore, help reduce severe clinical complications such as recurrent cholangitis, cholecystitis, hepatic tumours, cysts, calcification, cholelithiasis, pancreatitis, most importantly, cholangiocarcinoma related to Opisthorchis viverrini and possibly Clonorchis sinensis, and liver fibrosis associated with Fasciola hepatica infections. Highly effective antiparasitic treatment is available for all flukes. SUMMARY: There is a better understanding of risk factors, clinical manifestations and complications, novel diagnosis tests and effective treatment, which together should help reduce the morbidity and mortality of these infections.

Infecçäo por Clonorchis sinensis em imigrantes asiáticos no Brasil: tratamento com praziquantel / Clonorchis sinensis infections in Asian immigrants in Brazil: treatment with praziquantel

Estudaram-se quinze pacientes com infecçäo assintomática por Clonorchis sinensis, revelada através de exame parasitológico de fezes. Todos eram de origem asiática e procuraram o Laboratório Central do Instituto Adolfo Lutz para se submeterem a exames laboratoriais necessários a regularizaçäo de sua situaçäo, face a nova legislaçäo sobre imigrantes. Eram todos indivíduos adultos, seis pertencendo ao sexo feminino e nove ao masculino. Os quinze pacientes comn clonorquíase foram internados no Hospital das Clínicas da FMUSP e tratados com Praziquantel, na dosagem de 60 mg/Kg de peso corporal, dividida em duas tomadas. Foram realizados exames coprológicos quantitativos (método de Kato-Katz), antes do tratamento específico e no 15§, 30§ e 60§ dias após a terapêutica. Na última avaliaçäo (60§ dias após terapêutica), em nove pacientes (60,0%) näo se encontraram ovos do treamatódeo nas fezes e nos seis (40,0%), que continuavam eliminando ovos, notou-se reduçäo na quantidade eliminada (superior a 90% em cinco e a 30% no paciente restante). Os pacientes foram também submetidos a exames subsidiários, para avaliaçäo do estado geral e funçäo hepática, antes da administraçäo de Praziquantel e, posteriormente, no seguimento ambulatorial. A medicaçäo foi relativamente bem tolerada pelos pacientes, verificando-se a ocorrência de efeitos colaterais representados por náuseas e vômitos (dois casos), vertigens e tonturas (dois casos), epigastralgia (dois casos) e diarréia no 3§ dia após tratamento (um caso)

[Infection by Clonorchis sinensis in Asian immigrants in Brazil. Treatment with praziquantel]. / Infecção por Clonorchis sinensis em imigrantes asiáticos no Brasil. Tratamento com praziquantel.

Fifteen adult patients with assymptomatic infection due to Clonorchis sinensis, diagnosed by coprological examination, were studied. They all came from Asia (twelve from Taiwan, two from South Korea and one from Hong Kong) and were examined at the Adolfo Lutz Institute and the Department of Infectious Diseases, School of Medicine, University of São Paulo, in São Paulo, Brazil. Six patients were women and nine men. All studied patients were admitted to hospital and treated with praziquantel (60 mg/kg). Previous to treatment and on the 15th, 30th and 60th days after praziquantel administration, patients were submitted to quantitative stool examinations, according to Kato-Katz's technique and to hematological and biochemical serum analysis. After a 60 day follow-up nine patients (60%) were negative for C. sinensis eggs in stools. Those not cured after praziquantel administration (six patients, 40%) revealed a sharp decline in faecal elimination of C. sinensis eggs.