First generation of laboratory bred Biomphalaria pfeifferi measuring approximately 8mm in diameter were collected and grouped into four batches. Batches 1, 2 and 3 consisted of uninfected snails aestivated for 7, 14 and 21 days respectively. The fourth group had snails which been infected with Schistosoma mansoni miracidia and then aestivated 7 days post miracidial exposure, for one week. Results obtained showed that there was a significant increase in the growth of reactivated infected and uninfected snails. Weekly monitoring of fecundity showed that ovipository activity was lower among the infected group of snails. A higher level of egg production was also seen in reactivated snails than in the unaestivated B. pfeifferi.


Key Words: Schistosoma mansoni, aestivation, fecundity and growth


Nig. J. Health and Biomed. Sciences Vol.2(2) 2003: 98-102