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Evaluation of the resistance to Schistosoma mansoni infection in Nectomys squamipes (Rodentia: Cricetidae), a natural host of infection in Brazil

Avaliação da resistencia na infecção por Schistosoma mansoni em Nectomys squamipes (Rodentia: Cricetidae) um hospedeiro natural da infecção no Brasil

The development of resistance in three stages throughout an active infection (pre-ovular, acute and initial chronic stages) was studied, comparing the total number of adult worms recovered from the reinfected group and the control groups. It was shown that Nectomys squamipes was unable to develop resistance in the tested conditions and, on the other hand, reinfection in the pre-ovular period of the parasite led the rodent to present the phenomenonacilitation, with reduction of natural resistance and an increase in the parasite load. These results suggest the existence of other forms of immunity diverse from the concomitant immunity in the host-parasite relationship, according to the employed model.

Nectomys squamipes; Reinfection; Immunity; Wild rodent; Experimental schistosomiasis; Schistosoma mansoni


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