A 24-year-old man calls the office to report bilateral 

maxillary sinus congestion, pain, and discharge that 

initially was clear but now is disturbingly yellow- 

green 6 days into the illness. He states his symptoms 

are exactly like the sinusitis he had several years ago 

that responded well to an antibiotic. He feels feverish 

and achy with mild headache. Although no better, he 

is not clearly worse than when the discharge was 

clear. Which of the following is correct based on cur- 

rent guidelines? 

A 45-year-old housewife with a prior history of Lyme 

disease with Bell's palsy presents in June with a sev- 

eral day history of enlarging rash on her lower leg. 

She has cats as pets and often sustains scratches and 

bites, although she cannot remember a specific bite at 

the area of infection. On examination, she has a uni- 

formly red, minimally tender, 6-cm red patch. The 

remainder of the examination is unremarkable. 

Because you cannot reliably distinguish a cat-related 

cellulitis from Lyme disease, you decide to cover her 

for both potential infections. Which of the following 

choices adequately covers both cat-associated infec-

tions and Lyme disease? 

Which MaTT (mycobacterium other than tuberculo- 

sis) is correctly paired with its common dinical char- 

acteristics? 

1. M. marinurn: Ulcerative oral nodules 

2. M. scrofulaceurn: Submandibular lymphadenitis 

3. M. kansasii: Inguinal lymphadenitis 

4. M. fortuiturn: Postoperative wound infections 

A 34-year-old woman with no medical problems pres- 

ents with 2 days of watery diarrhea. No blood is pres- 

ent in the stool. She has mild abdominal cramping 

and is afebrile. What is the most appropriate diag- 

nostic step? 

Which one of the following antibiotic regimens for the 

treatment of endocarditis would not be appropriate?