The role of Propionibacterium propionicus in chronic canaliculitis.

Delicate branching filaments, and cocci or rods, were seen by microscopic examination in the pus of the canaliculus lacrimalis in patients with chronic canaliculitis. Propionibacterium propionicus and different bacteria were cultivated and identified in the pus. After i.p. inoculation of mice with the Propionibacterium strains, the morphological changes characteristic of this microorganism were observed in the peritoneum, in the spleen and in the lung, giving an adequate explanation of the direct microscopic findings in the pus.