Etiology and Pathogenesis Pathogen: varies with region and time In USA and Europe: 1930s'-Group a strep 1940S'-E. Coli 1950s'-Staph aureus 1970S'-Group B Strep In China: Staphylococcus. E. Coli Opportunistic pathogens Drug resistanceEtiology and Pathogenesis ➢ Pathogen: varies with region and time In USA and Europe: 1930s’ – Group A Strep 1940s’ – E. Coli 1950s’ – Staph aureus 1970s’ – Group B Strep In China: Staphylococcus, E. Coli Opportunistic pathogens Drug resistance