giardiasis, is a parasitic infection from contaminated food or water? do you mean gonnorhea, i did look it up just in case, and its usually oral-anal route, or MSM(men sex with men)(i assume the penetrator gets the parasite from the recievers poop particles. seems quite difficult to get it for the Victim.

there was a SVU episode where they had a little girl that was infected with gonnorhea, she was under 12 yo.