Serotypes and susceptibility of Streptococcus pneumoniae strains isolated from children in Mexico.

Objective: To identify serotypes and susceptibility of S. pneumoniae strains from 48 children with invasive infections and 50 carriers.

Material And Methods: Typing was performed by the Quellung reaction and susceptibility by Kirby-Bauer and Etest according to CLSI standards.

Results: Of 31 meningeal strains, serotypes 19F, 3, 6B, 14 and 23F were predominant. Resistance to penicillin and STX was 16 and 58%, respectively; of 17 invasive non-meningeal strains, serotypes 19F and 3 were predominant and resistance to penicillin and SXT was 0 and 82%, respectively; of carrier strains, serotypes 6A, 6B, 19F and 23F were predominant.

Conclusions: A 10-valent conjugate vaccine could offer a better coverage for meningeal strains.