The genus Bertiella has 29 cestode species that infect primarily non-human primates.

[citation needed] First, the eggs and proglottids are passed in the feces of the definitive host.

The cysticercoid everts an unarmed scolex, which it uses to attach to the small intestinal wall.

Adults remain in the small intestine of the host, releasing eggs and repeating the cycle.

[citation needed] Human cases are exceptionally rare, but most patients have reported no symptoms or some mild gastrointestinal symptoms, ranging from constipation, loss of appetite and weight, to general fatigue.