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La prevalencia de los distintos serotipos<br />
depende de la región geográfica<br />
14,6,19,18,23,9,4<br />
14,6,19,18,23,9,1<br />
1,19,6,5,14,7,23<br />
6,14,1,19,23,5,15<br />
14,6,5,1,19,23,18<br />
14,6,19,23,18,8,7