Experimental ocular tuberculosis in guinea pigs

Narsing A. Rao, Thomas A. Albini, Mirnalini Kumaradas, Michael L. Pinn, Mostafa M. Fraig, Petros C. Karakousis

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Objective: To develop an animal model of intraocular tuberculosis (TB) with features of pulmonary TB and extrapulmonary dissemination to the eye. Methods: Hartley strain guinea pigs were infected via an aerosol route with virulent Mycobacterium tuberculosis. One group of guinea pigs was infected with a relatively low bacterial inoculum and received no treatment. A second group of guinea pigs received high-dose infection and were treated with the first-line anti-TB drugs isoniazid, rifampin, and pyrazinamide. Development of ocular TB lesions was documented by histological analysis, acid-fast staining, and real-time polymerase chain reaction for M tuberculosis DNA. Results: Untreated guinea pigs developed pulmonary and extrapulmonary TB. Ocular TB, primarily involving the uvea, developed in 5 of 12 eyes (42%). Uveal granulomatous lesions showed the presence of acid-fast organisms and M tuberculosis DNA. In treated animals, none of the 8 eyes examined revealed the presence of acidfast organisms; however, there was mild nongranulomatous uveitis in 4 eyes. Conclusions: Mycobacterium tuberculosis delivered via aerosol to guinea pigs results in extrapulmonary dissemination to the eye. Of significance, intraocular changes in this model include granulomatous inflammation and the presence of acid-fast organisms, as seen in human cases of ocular TB. Clinical Relevance: The guinea pig model may provide greater insight into the pathogenesis of intraocular TB and assist in the development of novel modalities to treat this global infectious disease.

Original languageEnglish (US)
Pages (from-to)1162-1166
Number of pages5
JournalArchives of ophthalmology
Issue number9
StatePublished - Sep 2009

ASJC Scopus subject areas

  • Ophthalmology


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