A 44-year-old woman with type 2 diabetes mellitus comes to the physician with a 3-day history of fever, right calf pain, and swelling. Her temperature is 38.7°C (101.7°F). Physical examination shows a 5 x 6-cm erythematous, warm, raised skin lesion with well-defined margins over the right upper posterior calf. The organism isolated from the lesion forms large mucoid colonies on blood agar. Further evaluation shows that the organism has a thick hyaluronic acid capsule. The causal organism of this patient's condition is most likely to have which of the following additional characteristics?
- A)Gamma hemolysis
- B)Solubility in bile
- C)Resistance to novobiocin
- D)Susceptibility to bacitracinGABARITO
- E)Negative pyrrolidonyl arylamidase test
Explicação
This patient has erysipelas (well-demarcated, raised, erythematous skin lesion with fever) caused by Streptococcus pyogenes (GAS). GAS is identified by its thick hyaluronic acid capsule, mucoid colonies on blood agar, beta-hemolysis, bacitracin sensitivity, an... Ver explicação completa e trilha adaptativa →