How long can someone be infected with a Schistosoma parasite and have Schistosomiasis but remain asyptomatic?

If a patient had been swimming somewhere such as Lake Malawi and come back to the UK and did not get tested for Schistosomiasis, is it possible that they could be infected many years later and not know it, as they are asymptomatic?

Authored By Jeremy Walker on Thursday 15th November 2012