Virulence and multiresistance to drugs of epidemic strains of S. typhimurium isolated in children's hospitals of South America. I. Comparative virulence for mice of epidemic and nonepidemic strains of S. typhimurium
Virulencia y multirresistencia a drogas de cepas epidemicas de S. typhimurium aisladas en hospitales infantiles de Sudamerica. I. Virulencia comparativa para el raton de cepas epidemicas y no epidemicas de S. typhimurium