A woman developed a well-defined, slightly raised, and indurated erythema that was hot, shiny, and tender. Most likely this is an infection of the dermis and subcutis caused by
A. Staphylococcus epidermidis
B. Staphylococcus saprophyticus
C. Streptococcus agalactiae
D. Streptococcus pyogenes
E. Streptococcus pneumoniae
D
This woman has erysipelas, an infection of the dermis and subcutis, which is most likely caused by group A Streptococcus pyogenes. Group B S. agalactiae is a commensal in the vagina and may cause infection of neonates, such as meningitis or septicemia. S. epidermidis often infects prostheses, shunts, and catheters. S. saprophyticus is a rare cause of postcoital urinary tract infection in women. S. pneumoniae is an important cause of pneumonia, otitis media, and meningitis.
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