Assertion: smallpox's contact | /r/HasProperty | vaccinated after exposure
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Source sentences:
text: During an epidemic in Italy in 1946, 21 contacts who received vaccine within 5 days after exposure and in whom smallpox subsequently developed all had mild disease, whereas 31 contacts who were vaccinated 6 to 10 days after exposure had a case-fatality rate of 19% (Dixon 1948).