The tapeworm contraceptive
Despite intensive research, scientists have so far failed to find the perfect contraceptive for women – let alone men. However, a study in freshwater fish of the carp family has found a parasite, Ligula intestinalis, that makes the fish infertile. The infertility appears to be caused by a compound released by the parasite, which suppresses the production of eggs in females and sperm in males. Professor Chris Arme at Keele University has also shown that the contraceptive effect is evident when the tapeworm is inserted into non-host species, such as toads.
Writing in the December issue of Biologist (to be published 6 December), Chris Arme is not suggesting that people rush out and infect themselves with fish parasites. He is working to isolate the contraceptive chemical in the hope that it can be developed for human use. ‘It and its mode of action may well be unique.’ He goes on to say, ‘The tapeworm contraceptive may yet come to occupy a place in our medicine cupboards. But, in contrast to the products currently available, this could be labelled “For him or for her”.’
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