Which of the following statements about Campylobacter is not correct?

a. In addition to being linked to such foods as poultry, Campylobacter outbreaks have also been linked to consumption of unpasteurized milk.
b. Campylobacter is a virus.
c. Campylobacter infection in humans has been linked to handling and eating raw or undercooked meat or poultry, whether fresh or frozen.
d. The illness caused by Campylobacter is called campylobacteriosis.