Salk; Jonas Edward; US-American biologist and physician (researched and developed a polio vaccine; the 鈥楽alk vaccine); 1914-1995.First field trial using the newly develped vaccine in Pittsburgh; Pennsylvania; 1954: Dr. Salk vaccinates and eight year old boy.Photo.
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Creative#:
TOP17615121
Source:
達志影像
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RM
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須由TPG 完整授權
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