Who knows – this may just work. From kuro5hin:
This is my personal account of curing my asthma and hayfever by deliberately infesting myself with the intestinal parasite hookworm.
It isn’t for the faint hearted and for some should not be read while eating.
It involves a great deal of research, a trip to Cameroon and a lot of barefoot walking in open air latrines in west Africa.
If you have asthma, or know someone who has asthma (or for that matter Crohn’s disease, IBD or colitis) and are suffering badly you owe it to yourself to consider this approach. Because although it sounds strange and is repellant it is founded on sound science and it has one other virtue.