Fig 1.

Filter culture of the patient's stool sample. Small glistening colonies were identified as Campylobacter upsaliensis and grew in 72 h (A). The characteristic Gram stain morphology for C. upsaliensis is seen in panel B. Large white creamy colonies stained as Gram-positive rods, grew in less than 24 h, are regularly seen on Campylobacter-negative cultures, and were not consistent with Campylobacter (A).