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why 1957?- measles

March 11, 2019 12:43PM

the vaccine became available in 1963, both live and killed versions. The killed version is said to be less effective than the live one.
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why 1957?- measles

chimi 107 March 11, 2019 12:43PM

ask the experts

chimi 31 March 11, 2019 12:44PM

another 1957 answer

chimi 33 March 11, 2019 12:45PM

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