Detection of varicella zoster virus DNA and viral antigen in human eyes after herpes zoster ophthalmicus1
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Patients
Nine surgically enucleated eyes and four corneal buttons obtained after penetrating keratoplasty were studied from 13 patients who had a clinical diagnosis of HZO. The study included seven female and six male patients ranging in age from 19 to 86 years (median, 75 years). The interval between clinical onset of HZO and surgery varied from 1 day to 19 years (median, 36 months). Two patients (patients 1 and 2; Table 1) showed the clinical features of acute HZO 1 and 7 days after clinical onset,
Histopathologic analysis
The previously reported typical pattern of histopathologic changes in HZO16, 17 was confirmed in our series (Table 1). Major changes in the anterior segment of the eye included vascular corneal scarring (11 of 13) (Fig 2), granulomatous reaction to Descemet’s membrane (9 of 13) (Fig 2), and trabeculitis (8 of 9) (Fig 3). All eyes were diagnosed with a chronic nongranulomatous scleritis and episcleritis in combination with the typical segmental necrosis of iris stroma and anterior part of the
Discussion
Although the histopathologic features of HZO are well described,16, 17, 20, 21 the details of the pathogenesis and the pathomechanism of different ocular manifestations still are uncertain. The mechanism of a “smoldering” VZV infection with progressive destruction of the eye is discussed with special frequency. Some authors implicate different immunoreactions17 against inactive viral antigens or persisting viral replication,22 whereas others favor nerve damage,10 direct cytopathic effects of
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