Hello. Yes there is some research and small trials going on at Edinburgh and Nottingham Unis I think. I think they may be using whipworm rather than hookworm, but its the same principal.
I have been using hookworm since Spring 2011, increasing the dose gradually, and now host over 100 helminths. This is a safe dose level, I have no ill effects from the worms, and I have not had a relapse since starting. Of course its "only" been 18 months, so I'm not jumping to any conclusions, but so far so good.
The science behind this is very strong, though I dont claim to understand it all. Here is the Argentinian study http://www.ncbi.nlm.nih.gov/pubmed/17230481
convinced me that this was worth a try.
The problem with the trials is that it will take a long time for anything to come of them. In order for anyone to invest in full phase 3 trials they need something patentable. So they'll want to find, isolate, and patent the particluar active molecule(s) from the worms and turn it into a patented drug - this is where the money is. But this will take years.
So why wait for this when the natural product (that has evolved over thousands of years in symbiosis with humans) is available now. There is at least one company currently providing safe doses of hookworms and whipworms.