title: In-vitro antibacterial activity of RP 59500, a semisynthetic streptogramin, against Streptococcus pneumoniae.
abstract: The in-vitro activity of the new streptogramin RP 59500 was determined against 100 strains of Streptococcus pneumoniae. In all, 48 erythromycin-sensitive strains and 52 erythromycin-resistant strains were tested by an agar dilution method (MIC determination), 20 strains (eight erythromycin-sensitive and 12 erythromycin-resistant) were tested by a broth microdilution technique (MIC and MBC determination) and ten strains (two erythromycin-sensitive and eight erythromycin-resistant) were tested for bactericidal kinetics. The study showed that RP 59500 had good bacteristatic and bactericidal activity against both erythromycin-sensitive and erythromycin-resistant strains. On the basis of these results, and because the number of erythromycin-resistant strains of S. pneumoniae isolated in France has increased steadily since 1985, RP 59500 might be useful for the treatment of pneumococcal infections and warrants further investigation.
authors.affiliation: Centre National de Référence des Pneumocoques, Centre Hospitalier Intercommunal, Créteil, France.
authors.forename: A
authors.initials: A
authors.lastname: Fremaux
authors.forename: G
authors.initials: G
authors.lastname: Sissia
authors.forename: R
authors.initials: R
authors.lastname: Cohen
authors.forename: P
authors.initials: P
authors.lastname: Geslin
mesh_terms: D004917:Erythromycin / Q000494:pharmacology; D066298:In Vitro Techniques; D008826:Microbial Sensitivity Tests; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D014769:Virginiamycin / Q000494:pharmacology*
chemical_list: D014769:Virginiamycin; C062940:quinupristin-dalfopristin; D004917:Erythromycin