Between 1962 and 1964 more than 100 million Americans were inoculated, and by the mid-1960s his easy-to-administer vaccine--not Salk's--became the preferred one.
Between 1962 and 1964 more than 100 million Americans were inoculated on "Sabin Sundays, " and by the mid-1960s his easy-to-administer vaccine--not Salk's--became the preferred one.