Infecção natural de roedores silvestres pelo Schistosoma mansoni

Memórias do Instituto Oswaldo Cruz

Tânia Maria Correa Silva²  Zilton A. Andrade¹ 

[1] ,INAMPS Hospital Ana Nery Salvador,Brasil

关键词: Nectomys;    natural infection;    natural hosts;    Nectomys;    esquistossomose;    infecção natural;    hospedeiros naturais;    schistosomiasis;   

DOI  :  10.1590/S0074-02761989000200011

来源: SciELO

【 摘 要 】

In Planalto, a small locality in the interior of the Bahia state, Brazil, 47% of sylvatic rodents were found to be naturally infected with Schistosoma mansoni, whereas the prevalence of the infection in the inhabitants of the area was 3.26%. The rodents (Nectomys) live near the houses, in contact with water passing viable schistosome eggs in the stools. Worm burden is variable amongst such rodents. Periovular granulomas are small, especially in liver and intestines, and hepatic fibrosis is mild or absent, with no morphological evidence of portal hypertension being noted. Miracidia isolated from the eggs recovered from Nectomys readly infected laboratory-raised Bahia strain of Biophalaria glabrata. Cercariae then obtained infected Swiss mice in a similar way as the human strains of S. mansoni kept in laboratory. Also, Swiss mice left in contact with water collections in Planalto were easily infected, which proved the transmissibility potential of the area. In conclusion: sylvatic rodents in the area of Planalto tolerate well S. mansoni infection, eliminate viable eggs in the stools, are usually infected with a strain probably of human origin and therefore may play a role in maintaining parasite cycle in the area.

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