question: Hi Doc,I'm worried about the prospects of intestinal parasite. Last night i went to bath in my bath tub it was like a short 15 minutes bath during the time i was fully submerged and rinsed with the water present in the tub. Now in between half way between the bath i realized the water to be little murky and there was like stain spots left on the side surfaces of the bath-tub. I'm concerned about catching any type of intestinal parasite by bathing in un-clean bath-tub? Are my concerns justified..? Please helpthanks