I believe you. Not really unless you have a really bad systemic infection with them but it will all be down to bad die off. As I say with anti- parasite drugs if it won't kill you... It will heal you LOL! Seriously nothing worse for your body to have them around as it struggles on it's own to get rid of them.... When you use anti- parasite drugs you tip the balance in your favor. In my opinion if you suspect it... Treat it! Also see praziquantel as a test if you have them or not be it down to some bad initial reaction, stool, feeling better after, etc.