The resistant problem that I have is very rare and I know this. Parasites are opportunists and a lower immune system is when they take advantage. I have a fairly good system but did get severely ill and was under tremendous stress, when I got this from that individual.
I have a friend who just informed me that they think that they have a critter problem and have been aware of for about a year. I'm most certain that they will run into problems with getting rid of them. Last year they were sick 3 times with a strange bacterial infection and were given double doses of steroids to bring the problem under control for 2 weeks, each time. So in this case, the person has steroid parasites which would make them stronger. Her husband has a very strong immune system, so he might not be infected by the problem.