A 21-year-old man comes to the physician because of painful, firm, dark bumps on his neck and jawline. He has no history of serious illness and takes no medications. His brother had a similar rash. A photograph of the rash is shown. Which of the following is the most likely underlying mechanism of this patient's condition?
ATrichophyton infection of the superficial hair follicle
BInterfollicular penetration of the skin by distal end of hair
CBacterial infection of the superficial or deep hair follicle
DFollicular obstruction with subsequent duct rupture
ECutibacterium acnes colonization of the pilosebaceous unit
A 65-year-old man presents to the emergency department with a complaint of intense pain in his right foot for the past month, along with fever and chills. He denies any traumatic injury to his foot in recent memory. He has a medical history of poorly-controlled type II diabetes and is a former smoker with extensive peripheral vascular disease. On physical exam, the area of his right foot around the hallux is swollen, erythematous, tender to light palpation, and reveals exposed bone. Labs are notable for elevated C-reactive protein and erythrocyte sedimentation rate. The physician obtains a biopsy for culture. What is the most likely causative organism for this patient’s condition?
APasteurella multocida
BMycobacterium tuberculosis
CStaphylococcus aureus
DPseudomonas aeruginosa
ENeisseria gonorrhoeae
A 47-year-old woman comes to the physician because of a 6-week history of fatigue and low-grade fever. She has no history of serious illness except for a bicuspid aortic valve, diagnosed 10 years ago. She does not use illicit drugs. Her temperature is 37.7°C (99.9°F). Physical examination shows petechiae under the fingernails and multiple tender, red nodules on the fingers. A new grade 2/6 diastolic murmur is heard at the right second intercostal space. Which of the following is the most likely causal organism?
AStaphylococcus epidermidis
BStreptococcus pyogenes
CStreptococcus sanguinis
DStreptococcus pneumoniae
EEnterococcus faecalis
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