Herpesvirus eye infections show distinct patterns linked to immune status
Herpesviruses are a family of DNA viruses that cause a range of infections in humans and animals. A distinctive characteristic is that they can remain dormant in the body for prolonged periods, and reactivation may lead to conditions such as keratitis, uveitis or viral retinitis.
Herpesvirus retinitis, a condition causing significant visual impairment through retinal tissue destruction and vascular inflammation, has distinct clinical patterns depending on the patient's immune status. The study conducted by researchers at Institute of Science Tokyo in Japan identified two major forms: acute retinal necrosis (ARN), commonly affecting immunocompetent individuals, and cytomegalovirus retinitis (CMVR), prevalent in immunocompromised patients.
This retrospective longitudinal cohort study, spanning from 2013 to 2025, analyzed 64 cases of ARN and 56 cases of CMVR, revealing differences in immune status, disease subtypes, visual acuity at presentation, retinal lesion extent, inflammation severity, intraocular fluid findings, timing of retinal detachment diagnosis, therapeutic interventions, and final visual outcomes.
ARN was more frequent in immunocompetent individuals, frequently unilateral, and showed a rapidly progressive clinical phenotype, while CMVR was strongly linked to immunocompromised conditions such as lymphoma, autoimmune diseases, transplantation history, and prior immunosuppressive therapy, following an indolent course. ARN was more likely to lead to retinal detachment (RD), with detachment occurring sooner after diagnosis.
Poor initial vision was associated with a heightened risk of RD. Late-onset RD was linked to poorer visual outcomes. These findings underscore the importance of considering host immune status when assessing herpesvirus retinitis, as it may influence distinct patterns of viral replication, inflammation, and retinal damage. The study concludes that evaluating patients' immune status and ocular findings at initial presentation could aid in predicting the risk of severe disease progression and visual impairment, guiding monitoring and management accordingly.
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