Circulation of Streptococcus pneumoniae clone Colombia⁵ ST289 in nine Latin American countries

Objective. To determine genetic relatedness of clone Colombia⁵ ST289 with invasive Streptococcus pneumoniae serotype 5 isolates recovered in nine Latin American countries. Methods. Forty-four invasive S. pneumoniae serotype 5 isolates recovered from children under 5 years of age in Bolivia, Chile, Dominican Republic, Ecuador, Nicaragua, Panama, Paraguay, Peru, and Venezuela were studied. Pulsed-field gel electrophoresis patterns of DNA treated with Smal restriction enzyme were classified using Tenover's criteria and analyzed with the Fingerprinting II program to determine their genetic relatedness with the Colombian clone. Results. All isolates had a genetic similarity of 78.5% or more with the Colombian clone. Thirteen electrophoretic subtypes derived of pattern A were identified, and five of them (A5, A6, A8, A13, All) comprised 61.4% of the isolates. Conclusions. Clone Colombia ⁵ ST289 is disseminated in Latin America. This is important because S. pneumoniae serotype 5 frequently causes invasive disease in the region and is associated with trimethoprim-sulfamethoxazole resistance.