Infectious Diseases

	Answer 2 Fusobacterium species and microaerophilic Streptococcus species. Fusobacterium species and microaerophilic Streptococcus species are more frequently identified as causes of lung abscess as compared with other microorganisms such as Nocardia species, P. aeruginosa, Staphylococcus aureus, and Streptococcus pneumoniae.1 This patient’s clinical history and aerobic culture showing no growth of microorganisms on Gram stain also support this diagnosis. If aspiration occurs while the patient is in the hospital, Staphylococcus aureus, P. aeruginosa, and Enterobacter species should be considered as potential pathogens. REFERENCE 1. Bartlett JG, Gorbach SL, Tally FP, Finegold SM. Bacteriology and treatment of primary lung abscess. Am Rev Respir Dis 1974;109:510–8. Click here to return to the questions
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