Assertion: smallpox | /r/CapableOf | continue to be part of the 20th
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Source sentences:
text: Smallpox continued to be a significant health threat throughout the 18th and 19th centuries, and part of the 20th, but the introduction and success of inoculation in the early 1700s, followed later by the much safer vaccination method developed by Edward Jenner, steadily reduced the threat the disease posed until its eradication in 1980 (Figure 2) .