question: my 33 year old sister was having horrible diarreha about 1 month ago.  She went to the Dr. at which time they ran test and found that she had Giardia and was also anemic.  They gave her medication for the parasite.  During that time, they also found liver lesions via ultrasound.  She started feeling bad again and the diarreha returned this week.  She went back to the Dr. and was diagnosed with c difficile and a protozoa.  They are doing a contrast MRI to check the liver lesions tomorrow.  What could be causing this?