I know it's been 7 years but someone else may be seeking answers. From what I have gathered it is the reverse, liver blockage results in low bile flow which allows for the proliferation of Candida. So Candida will not be under control until the liver is unclogged. Ultrasound to my knowledge cannot pick up uncalcified blockages. The liver can still have blocked bile ducts impeding the flow of bile even if it is not picked up on an ultrasound.