A Data Driven Approach to Coordinate Challenging Smallpox Vaccine Logistics The Specific Situation • A r andomiz ed , double -blind , plac ebo - c on tr olled P hase III smallpo x v ac cine immunogenicit y and saf et y study needed t o enr oll 4,000 health y subjec ts acr oss 34 sit es in the US, f or a tr ial lasting up t o nine mon ths . • T he Sponsor selec t ed Chilt er n t o per f or m full ser vic es , including c oor dina tion of the

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