Capsule did not affect colonization of the nasopharynx but only nonencapsulated strains reached the lungs.

Abstract

<p>Each symbol represents the CFU from the nasopharynx or lungs of an individual mouse on days 1, 3, 8 and 15 after intranasal inoculation. (No bacteria were detected at day 0 before any bacteria were administered.) Horizontal bars indicate means.</p