"Though he eventually hopes to eliminate hookworms entirely from his allergy treatment, Dr. Pritchard has few qualms about venturing where no parasite researcher has gone before.

?I gave myself 50 worms, and I felt it,? he recounted. ?I had stomach pains and diarrhea. But with 10 worms, we?ve ascertained a dose that does not cause symptoms. The patients are happy. They?ve kept their worms, and I get an e-mail a day from people all over the world who want to be infected.?" (NY Times)