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Influence of Population Immunosuppression and Past Vaccination on Smallpox ReemergenceMacIntyre, C. Raina; Costantino, Valentina; Chen, Xin; Segelov, Eva; Chughtai, Abrar Ahmad; Kelleher, Anthony; Kunasekaran, Mohana; Lane, John Michael · Emerging Infectious Diseases · 2018