During a routine follow-up appointment for Mycobacterium avium complex lung infection, a 79-year-old male noted that he developed loose stools and abdominal pain 2 days prior to his appointment. The patient resides in Mexico City and travels to Arizona for his medical care. A molecular gastrointestinal pathogens panel was ordered and tested positive for a concerning target. Additionally, subculture of the stool revealed growth of oxidase positive gram negative bacilli, which on subculture were beta-hemolytic on sheep blood agar, non-lactose fermenting on MacConkey agar and gram stain revealed curved gram negative bacilli. Subculture to thiosulfate-citrate-bile salts-sucrose agar revealed sucrose fermenting (yellow) colonies. The species identification was ultimately confirmed by MALDI-TOF mass spectrometry.

Can you guess his diagnosis?

Watch the video below to find out what caused his illness.

Contact Information

Nicole Jackson, njackson@asmusa.org