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Smallpox is an ancient disease and was present in Africa, Asia and Europe since 400 BC. It is unclear whether smallpox was indigenous to Africa or was introduced early on. Sudan had a great experience in eradication phase of smallpox diseases. This s
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f52c2e647305f5c74aed02140c9a91f3
