Identificação de roedores silvestres como hospedeiros do Angiostrongylus costaricensis no sul do Brasil

Abstract

Um número crescente de casos de angiostrongilíase abdominal tem sido detectado no sul do Brasil. O principal hospedeiro do Angiostrongylus costaricensis na América Central, o rato do algodão (Sigmodon hispidus), não ocorre na América do Sul, exceto no norte do Peru, Colômbia e Venezuela. Foram realizadas capturas na área endêmica do Rio Grande do Sul (RS), visando identificar hospedeiros para obtenção de vermes em laboratório e produção de antígeno. Pela primeira vez no Brasil foi constatada a infecção em roedores: Oryzomys nigripes e Oryzomys ratticeps. O. nigripes é um roedor silvestre de pequeno porte e parece ser o principal hospedeiro definitivo do A. costaricensis na região serrana do RS.

Abdominal Angiostrongylosis in Southern Brazil - Prevalence and Parasitic Burden in Mollusc Intermediate Hosts from Eighteen Endemic Foci

“…Molluscs are involved in the cycle as intermediate hosts, producing the third stage larvae (L3), infective for the definitive host. The adult worm lives inside the mesenteric arteries in wild rodents, like Sigmodon hispidus in Central America and Oryzomys nigripes in southern Brazil (Morera 1973, Graeff-Teixeira et al 1990. A new conception on the migration and maturation of this parasite in definitive hosts has recently been proposed by Mota and Lenzi (1995).…”

First report of Angiostrongylus cantonensis (Nematoda: Metastrongylidae) in Achatina fulica (Mollusca: Gastropoda) from Southeast and South Brazil

“…O. ratticeps) (Graeff-Teixeira et al 1990). However, no detailed information regarding the definitive hosts of A. cantonensis in South America is currently available.…”

Jejunal perforation caused by abdominal angiostrongyliasis

“…Its well-adapted and definitive hosts are forest rodents (Sigmodon hispidus, Rattus rattus, Oryzomys nigripes and Oryzomys ratticeps) 12 and its intermediate hosts are land mollusks, especially from the Veronicellidae (Vaginulus Sarasinula plebeius) family, commonly known as slugs 20 . Adult forms of nematodes inhabit the rodents' mesenteric arteries in the ileocecal region, which is their predominant egg-laying site.…”