Eficacia vs efectividad de una vacuna: cómo se miden y en qué se diferencian
La farmacéutica Pfizer afirmó este lunes que su vacuna contra el COVID-19 demostró una “tasa de eficacia superior al 90%”. Esto pronto se tradujo en un 90% de “efectividad” en la prevención del nuevo coronavirus. Pero, ¿cuál es la diferencia?
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