Spiral bacteria have one or more twists in them.  They are usually one of three shapes:  commas (vibrio/vibrios), rigid wavy shapes (spirillum/spirallae) or flexible corkscrews (spirochete/spirochetes). Campylobacter fetus is a vibrio that causes abortion in cattle and sheep,and fever and other symptoms in humans. Campylobacter jejuni is a vibrio that causes enteritis in humans. Vibrio cholerae causes cholera in humans. Spirillum volutans and Rhodospirillum rubrum are nonpathogenic spirillae.  Treponema pallidum is the pathogenic spirochete that causes syphilis. All images are at 1000 X magnification.
 

 

1. vibrios Campylobacter fetus	2.  vibrios Campylobacter fetus	3. vibrios Campylobacter jejuni	4. vibrios Campylobacter jejuni	5. vibrios Vibrio cholerae
6. spirillae Spirillum volutans	7.  spirillae Spirillum volutans	8. spirillae Rhodospirillum rubrum	9.spirochetes Treponema pallidum	10. spirochetes Treponema pallidum