50th anniversary of the Salk vaccine
On Apr. 12, 2005 marked the 50th anniversary of the Salk vaccine. Efforts to eradicate polio worldwide remain necessary, with just over 1,200 cases globally.
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On Apr. 12, 2005 marked the 50th anniversary of the Salk vaccine. Efforts to eradicate polio worldwide remain necessary, with just over 1,200 cases globally.
Tags: