Strange the study might have used a placebo group of people infected with parasites. I guess they needed to test if their process actually was effective in generating hookworm infections?
They were testing a vaccine to prevent hookworm infection. [0] After giving the experimental vaccine, they intentionally inoculated the research subjects with hookworms to measure whether the vaccine prevented hookworm infection.
blendergeek|5 years ago
[0] https://twitter.com/JimmyBernot/status/1354443850153144321
rkagerer|5 years ago