Thanks a lot Dave505. I had all tests done including the antigen test and it was positive for giardia. All other reports came negative, even the IgA test for antibody. I read somewhere that HIV positive people and others with immunity problems are the ones who develop chronic giardiasis. Would like to know how long you been suffering from this. Now that conventional medicine has failed to treat me, i am looking at ayurvedic or naturopathic cures.