Attempt At A Vaccine
Nicolle surmised that he could make a simple vaccine by crushing up the lice and mixing it with blood serum from recovered patients. He first tried this vaccine on himself, and when he stayed healthy he tried it on a few children (because of their better immune systems), who developed typhus but recovered.
He did not succeed in his effort to develop a practical vaccine. The next step would be taken by Rudolf Weigl in 1930.
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