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  • Title: Serotypes of 286 group B streptococci isolated from asymptomatic carriers and invasive disease cases in Mexico.
    Author: Palacios GC, González MN, Beltrán M, Arredondo JL, Torres J, Solórzano F.
    Journal: Rev Latinoam Microbiol; 2005; 47(1-2):21-4. PubMed ID: 17061543.
    Abstract:
    BACKGROUND: Group B Streptococcus (GBS) remains as a leading cause of neonatal sepsis and meningitis in developed countries, where type III is the most common serotype. Although GBS is considered an uncommon cause of perinatal pathology in Mexico, a vaginal colonization rate of 14% in pregnant women and a neonatal infection rate of 1/1500 live births have been reported. The aim of this study was to determine the serotype distribution in a collection of 286 GBS strains isolated in Mexico from asymptomatic carriers and in adult and neonatal invasive disease cases. METHODS: The collection included GBS strains isolated between January 1988 and April 1998 at the Instituto Nacional de Perinatologia and Hospital de Pediatria in Mexico City. GBS and serotype were confirmed by latex agglutination. RESULTS: Most strains were isolated from asymptomatic carriers (66%). 30% were invasive isolates, and 10% of them were from neonates. 48.6% were type I, 32.9% type III, 14% type II, and 4% were non-typeable. CONCLUSION: Serotype I is predominant in Mexico but participation of serotype III is increasing, and a decrease of non-typeable isolates was detected.
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