Gram negative curved, S-shaped, spiral rods or helical

1-3 x 0.2-0.9 µm

Rods may form spherical or coccoid bodies in old cultures or cultures exposed to air for prolonged periods.

Aerotolerant

BA: colonies may be low, flat, grayish, finely granular, and translucent appearance with an irregular edge, and a tendency to swarm and merge or may be round, 1-2 mm diameter, raised, convex, smooth, shiny, with an entire, translucent edge and a darker, opaque center.

Usually weakly α-hemolytic.

aeroob/30ºC
Butzler agar = Campylobacter Selective Agar
After 24-48 hours flat, moist and shiny colonies.
In the thick areas inoculated colonies get a metallic gray blue tint.
They are able to swarm on the culture medium in part or sometimes in whole.
Sometimes round colonies with smooth edges, shiny and with a diameter of 2-3 mm.

CCDA agar = Campylobacter Blood-Free Selective Medium
Same as Butzler

anaeroob/35-37ºC: growth

James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition