Figure 3

Colonization of S. pneumoniae in the respiratory tract of mice obtained after the administration of Ampicillin. The figures express the number of S. pneumoniae in nasal instillations, pharynx, trachea, bronchia or lung from mice, challenged with S. pneumoniae (10⁸ CFU/mouse) and treated with 4 doses of Ampicillin. The inserted figure shows the number of pathogens obtained from control mice without antibiotic. (*) indicates differences statistically significant between the two groups of mice