El riesgo de parasitismo por Angiostrongylus cantonensis: una problemática reemergente en Cuba / The risk of parasitism by Angiostrongylus cantonensis: a re-emerging problem in Cuba / O risco de parasitismo devido a Angiostrongylus cantonensis: um problema reemergente em Cuba

RESUMEN Introducción: El riesgo de parasitismo por Angiostrongylus cantonensis transmitido por el caracol gigante africano es una problemática reemergente en Cuba. Objetivo: Sistematizar contenidos esenciales relacionados con el caracol gigante africano y el parásito Angiostrongylus cantonensis, el riesgo de meningitis eosinofílica y su manejo. Método: En el Hospital General Docente "Dr. Agostinho Neto", entre septiembre y diciembre de 2019 se hizo una revisión narrativa sobre el tema a través de una búsqueda en bases de datos electrónicas (Biblioteca Virtual en Salud): LILACS, PubMed, SciELO, RedALyC, Scopus, Cochrane. Resultados: La información se estructuró en caracterización del caracol gigante africano y el riesgo de infección por Angiostrongylus cantonensis en Cuba, patogénesis y epidemiologia de la angiostrongylosis, y diagnóstico y tratamiento de la meningitis eosinofílica por este nemátodo. Se identificaron controversias sobre los criterios diagnósticos, el protocolo de actuación para su prevención y rehabilitación, y la carencia de un instrumento para estratificar el riesgo de esta infección. Conclusiones: Se sistematizaron contenidos esenciales sobre el caracol gigante africano, lo que posibilita la preparación de los profesionales para incrementar la percepción del riesgo de infección por Angiostrongylus cantonensis en la población.

ABSTRACT Introduction: The risk of parasitism by Angiostrongylus cantonensis transmitted by the giant African land snail, Lissachatina fulica is a re-emerging problem in Cuba. Objective: Systematize essential contents related to the giant African land snail and the parasite Angiostrongylus cantonensis, the risk of eosinophilic meningitis and its management. Method: A narrative review was made on the subject in the Teaching General Hospital "Dr. Agostinho Neto", between September and December 2019 through a search in electronic databases (Virtual Health Library): LILACS, PubMed, SciELO, RedALyC, Scopus, Cochrane. Results: The information was structured in the characterization of the African giant land snail and the risk of infection by Angiostrongylus cantonensis in Cuba, pathogenesis and epidemiology of angiostrongylosis, and diagnosis and treatment of eosinophilic meningitis by this nematode. Controversies were identified regarding the diagnostic criteria, the protocol of action for its prevention and rehabilitation, and the lack of an instrument to stratify the risk of this infection. Conclusions: Essential content on the giant African land snail was systematized, enabling the preparation of professionals to increase the perception of the risk of infection by Angiostrongylus cantonensis in the population.

RESUMO Introdução: O risco de parasitismo causado por Angiostrongylus cantonensis transmitido pelo caracol gigante africano é um problema reemergente em Cuba. Objetivo: Sistematizar conteúdos essenciais relacionados ao caracol gigante africano e ao parasita Angiostrongylus cantonensis, ao risco de meningite eosinofílica e seu manejo. Método: No Hospital Geral de Ensino "Dr. Agostinho Neto", entre setembro e dezembro de 2019, foi realizada uma revisão narrativa do assunto através de uma busca em bases de dados eletrônicas (Biblioteca Virtual em Saúde): LILACS, PubMed, SciELO, RedALyC, Scopus, Cochrane. Resultados: As informações foram estruturadas na caracterização do caracol gigante africano e no risco de infecção por Angiostrongylus cantonensis em Cuba, patogênese e epidemiologia da angiostrongilose, diagnóstico e tratamento da meningite eosinofílica por esse nematóide. Foram identificadas controvérsias sobre os critérios diagnósticos, o protocolo de ação para sua prevenção e reabilitação e a falta de um instrumento para estratificar o risco dessa infecção. Conclusões: Foram sistematizados conteúdos essenciais sobre o caracol gigante africano, o que possibilita a preparação de profissionais para aumentar a percepção do risco de infecção por Angiostrongylus cantonensis na população.

Proteomic analysis of excretory-secretory products from young adults of Angiostrongylus cantonensis

BACKGROUND Angiostrongyliasis is caused by the nematode Angiostrongylus cantonensis and can lead to eosinophilic meningitis and meningoencephalitis in humans. The young adult worms play central pathogenic roles in the central nervous system (CNS); however, the underlying mechanism is unclear. Excretory-secretory products (ESPs) are good investigation targets for studying the relationship between a host and its parasite. OBJECTIVES We aimed to profile, identify, and characterise the proteins in the ESPs of A. cantonensis young adults. METHODS The ESPs of young adult worms were collected from culture medium after incubation ranging from 24 to 96 h. Proteomic and bioinformatics analyses were performed to characterise the ESPs. FINDINGS A total of 51 spots were identified, and the highly expressed proteins included two protein disulphide isomerases, one calreticulin, and three uncharacterised proteins. Subsequently, approximately 254 proteins were identified in the ESPs of A. cantonensis young adults via liquid chromatography-mass spectrometry (LC-MS/MS) analysis, and these were further classified according to their characteristics and biological functions. Finally, we identified the immunoreactive proteins from a reference map of ESPs from A. cantonensis young adults. Approximately eight proteins were identified, including a protein disulphide isomerase, a putative aspartic protease, annexin, and five uncharacterised proteins. The study established and identified protein reference maps for the ESPs of A. cantonensis young adults. MAIN CONCLUSIONS The identified proteins may be potential targets for the development of diagnostic or therapeutic agents for human angiostrongyliasis.

Meningoencefalitis Eosinofílica / Eosinophilic Meningoencephalitis

El Angiostrongylus cantonensis es la causa infecciosa más frecuente de meningoencefalitis eosinofílica en el niño en nuestro medio. El huésped definitivo de este nemátodo es la rata y los humanos se infectan por la ingestión de larvas en tercer estadio presentes en huéspedes intermediarios como caracoles terrestres, transportadores como camarones y algunos peces que se ingieren crudos o mal cocinados o en productos vegetales frescos, contaminados por las secreciones de los caracoles. Las larvas ingeridas penetran en los vasos intestinales hasta llegar a las meninges, donde mueren al cabo de poco tiempo y producen una reacción eosinofílica que se manifiesta como meningitis aséptica. De las al menos 20 especies descritas de Angiostrongylus, solo dos afectan al hombre: el nemátodo Angiostrongylus cantonensis, el gusano del pulmón de la rata, es la causa más frecuente de meningitis eosinofílica. Angiostrongylus (Parastrongylus) costaricensis es el agente causal de la angiostrongyliasis abdominal, o intestinal. Se hace una descripción de los síntomas clínicos de la meningitis eosinofílica, causados por la presencia de las larvas en el cerebro y por las reacciones locales del hospedero. En muchas ocasiones los pacientes se pueden recuperar, pero en algunos casos la evolución puede ser fatal, sobre todo en las infecciones masivas.Se hace referencia a las características epidemiológicas de la enfermedad, el diagnóstico y el tratamiento. Se presenta un caso, diagnosticado en el servicio Miscelánea H de nuestro hospital.

The Angiostrongylus cantonensis is the most frequent infectious cause of eosinophilic meningoencephalitis in children in our settings. The definitive host of this nematode is the rat and the humans get infected by ingesting larvae in the third stage that are present in intermediate hosts like snails, carriers like shrimps and several fish that are eaten raw or bad cooked, or in fresh vegetables contaminated by the secretions of the snails. The ingested larvae enter in to the intestinal vases until they arrive to the meninges, where they die soon, producing an eosinophilic reaction, manifested as aseptic meningitis. From the at least 20 species of Angiostrongylus described, only two affect humans. The nematode Angiostrongylus cantonensis , the worm of the rat lung, is the most frequent cause of the eosinophilic meningitis. The Angiostrongylus (Parastrongylus) costaricensis is the causal agent of the abdominal or intestinal angiostrongyliasis. We describe the clinical symptoms of the eosinophilic meningitis, caused by the presence of larvae in the brain and by the local reactions of the host. In many cases, the patient can recover, but in some cases the evolution can be fatal, especially when the infection is massive.