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[?]
[?]
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[?]
- ^
http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=vacc.chapter.3
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?
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.
- ^
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1200696
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?
?????? ?????
.
- ^
"Smallpox"
.
www.who.int
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. Retrieved
2022-12-06
.
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