http:www.bt.cdc.govagentsmallpoxoverviewdiseasefacts.aspCDC Smallpox Smallpox Overview
https://www.powershow.com/view/1461c3-ZGMzM/httpwww_bt_cdc_govagentsmallpoxoverviewdiseasefacts_aspCDC_Smallpox_Smallpox_Overview_powerpoint_ppt_presentation
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