A bedsonial (chlamydial) agent was found to be the cause of an acute follicular conjunctivitis in man. It was resistant to sulfonamides and did not possess an iodine-staining matrix. It was readily recoverable from the patient's conjunctival sac and from a cat believed to have been the host animal. Experimentally, it produced a conjunctivitis in kittens and was readily recoverable from their conjunctival sacs. This agent is believed to be identical with the agent of feline pneumonitis.
Ostler HB, Schachter J, Dawson CR. Acute Follicular Conjunctivitis of Epizootic OriginFeline Pneumonitis. Arch Ophthalmol. 1969;82(5):587-591. doi:10.1001/archopht.1969.00990020587003