Intraocular Coinfection by Toxoplasma gondii and EBV Possibly Transmitted Through Unpasteurized Goat Milk in an Immunocompetent Patient: A Case Report

Toxoplasma gondii is the most common infectious cause of posterior uveitis in immunocompetent adults. While the parasite is typically acquired through ingestion of undercooked meat or contaminated food and water, unpasteurized goat milk has been identified as a less frequent but plausible source of infection. Coinfections in ocular toxoplasmosis are rare, and the role of Epstein–Barr virus (EBV) in these coinfections remains poorly understood. We report the case of a 70-year-old immunocompetent male presenting with severe, refractory panuveitis in the left eye. Initial serologic testing confirmed acquired Toxoplasma gondii infection, and treatment was initiated with systemic antimicrobials and corticosteroids. Intraocular inflammation persisted despite sequential therapy with trimethoprim–sulfamethoxazole, clindamycin, and azithromycin, eventually requiring pars plana vitrectomy with intravitreal clindamycin and dexamethasone due to non-clearing vitreous hemorrhage. Vitreous PCR testing revealed intraocular concurrent detection of EBV DNA, prompting combined antimicrobial and antiviral therapy. Epidemiological history revealed recent consumption of unpasteurized goat milk, suggesting a potential oral transmission route for Toxoplasma gondii. Although visual acuity improved following surgical intervention and targeted therapy, it remained markedly compromised due to the severity of the disease. This case illustrates the diagnostic value of multiplex PCR in refractory uveitis, enabling the detection of Toxoplasma gondii and the concurrent detection of EBV DNA in an immunocompetent patient. It highlights the importance of early molecular testing and detailed epidemiological assessment, including atypical transmission routes such as unpasteurized goat milk.