A 49-year-old man comes to the physician for a 1-month history of worsening productive cough. Temperature is 101F. He has history of alcoholism. Sputum is foul-smelling. Culture shows numerous gram-positive cocci, gram-positive rods, and gram-negative rods. There is no growth of the gram-negative rods in aerobic conditions on MacConkey agar. A chest x-ray is shown.
Which of the following is the most likely organism comprising the gram-negative rods?
Bacteroides spp.
Corynebacterium spp.
E. coli
Mobiluncus
Peptostreptococcus
