This study aims to investigate the importance of the serum factors present in the plasma of resistant
Biomphalaria tenagophila
snails, when transferred to susceptible conspecific. Susceptible
B. tenagophila (CF) received plasma from resistant
B. tenagophila (Taim), and both were later infected with
Schistosoma mansoni
. We noticed that the plasma transfer showed an increase on the resistance of susceptible snails of about 86% when compared to the non-immunized group (p < 0.001).