JAMB - Biology (2017 - No. 44)

Liver fluke (Fasciola hepatica) is a parasite affecting a range of livestock and other species. Final hosts in which it can develop to sexual maturity include livestock such as sheep, cattle, horses, goats, alpacas and deer. People can be infected by eating water cress growing along creeks in fluke-infested country. While snails are intermediate hosts, sheep and pigs are definitive hosts.