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Durante las décadas de 1970 y 1980 se introdujeron las vacunas formuladas con proteínas purificadas o polisacáridos capsulares (16 ene 1970 año – 23 ene 1990 año)
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line of time
By
victor
16 nov 2017
0
0
278
fecha:
16 ene 1970 año
23 ene 1990 año
~ 20 years
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