Actually, the truth lies somewhere in between. The name says it all.
Man is the only known host so far.
It is transmitted from person to person by contamination of food, utensils and instruments. It is much more common in the developing world where almost all adults are infected. In the U.S. infection is uncommon before age 30 and becomes more common as one grows older. It is more common in lower socioeconomic groups. Its incidence seems to be declining in the western world, mainly because of improved sanitation and hygiene.