Gram stain of Campylobacter jejuni in stool

Gram stain of stool (x1000) can, in some cases, show Campylobacter jejuni, which are small, faint gram-negative curved rods that may be gull-winged in shape. This finding may provide presumptive evidence of Campylobacter infection prior to the results of stool culture. Optimal atmospheric condition is 85 percent nitrogen, 10 percent carbon dioxide, and 5 percent oxygen.