A 42-year-old woman comes to her primary care physician with 2 days of fever and malaise. She also says that she has a painful red lesion on her left hand that she noticed after shucking oysters at a recent family reunion. Physical exam reveals a well-demarcated swollen, tender, warm, red lesion on her left hand. Pressing the lesion causes a small amount of purulent drainage. The material is cultured and the causative organism is identified. Which of the following characteristics describes the organism that is most associated with this patient's mechanism of infection?
AGram-negative facultative anaerobe
BGram-negative aerobe
CGram-positive clusters
DGram-positive chains
EGram-negative anaerobe
A 6-month old child is brought to the ER by parents for one day of fever, decreased feeding, and lethargy. They report that neither she nor her siblings are immunized due to their concerns about vaccinations. On exam, the infant is toxic-appearing. Antibiotics are started and lumbar puncture reveals bacterial meningitis caused by a gram-negative, encapsulated organism that requires chocolate agar and the two factors shown in Image A for growth. Which organism does this best describe?
AGroup B Streptococcus
BHaemophilus influenzae
CMoraxella catarrhalis
DStreptococcus pneumoniae
EListeria monocytogenes
An investigator is studying a strain of bacteria that retains a blue color after crystal violet dye and acetone are applied. The bacteria are inoculated in a petri dish containing hypotonic saline. After the addition of an antibiotic, the bacteria swell and rupture. This antibiotic most likely belongs to which of the following classes?
AMacrolide
BCephalosporin
CSulfonamide
DFluoroquinolone
ETetracycline
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