Case report demonstrates chronic conjunctivitis caused by Rickettsia felis in a male cat owner, highlighting diagnostic methods.
Abstract Purpose To report the first case of chronic papillary conjunctivitis caused by Rickettsia felis infection. Case A 27-year-old man presented with a four-year history of unilateral papillary conjunctivitis refractory to multiple antibiotic courses. Examination revealed tarsal conjunctival injection, papillary hypertrophy, mucopurulent discharge, and eyelid laxity with entropion. The patient had a history of cat ownership for 5-6 years, suggesting possible exposure to the cat flea, and remained systemically asymptomatic without fever, rash, or lymphadenopathy. Metagenomic next-generation sequencing (mNGS), serology, and histopathology confirmed Rickettsia felis infection. Given the chronic intracellular nature of the infection, the patient received an extended 2-month course of oral doxycycline (100 mg twice daily) combined with topical therapy, with marked improvement observed by week 8 and subsequent entropion repair surgery. Conclusion This represents the first reported case of chronic, isolated rickettsial conjunctivitis without systemic involvement or Parinaud's oculoglandular syndrome features. This case highlights the importance of considering rickettsial infection in chronic, treatment-refractory conjunctivitis and demonstrates the value of metagenomic sequencing for diagnosis.
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