Vibrio cholera, the bacterium that causes the disease "cholera" is not a Coccus, Bacillus, or Spirillum.
being of the genus Vibrio, it is a Gram-negative curved/straight rod, motile by means of monotrichous flagellation (a single polar flagellum)
for a more complete description of the Vibrio genus, see Dr. Kenneth Todar, PhD's page on http://www.textbookofbacteriology.net/cholera.html
It should explain many of the traits common to genus Vibrio.