In a daring experiment in Europe, scientists used mosquitoes as flying needles to deliver a "vaccine" of live malaria parasites via their bites.
The results were astounding: Everyone in the vaccine group acquired immunity to malaria; everyone in a non-vaccinated group did not, and developed malaria when exposed to the parasites later.
http://news.xinhuanet.com/english/2009-07/31/content_11802064.htm
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