A HIV patient complains of visual disturbances. Fundal examination shows bilateral retinal exudates and perivascular haemorrhages. Which of the following viruses are most likely to be responsible for this retinitis -

CMV retinitis is the most common ocular infection in AIDS patient. CMV retinitis Presentation : Presents as a painless progressive loss of vision. Patients may also complain of 'blurred vision', Floaters and scintillations. Opthalmoscopic findings : (Bilateral) Characteristic retinal appearance ofperivascular haemorrhages and retinal exudates - Harrison Cotton wool spots appearing as a result of focal ischaemia of nerve fibre layer are characteristic Risk factors : The majority of cases of CMV retinitis occur in patients with CD4+ count < 50/ 1. Patients with CD4+ count < 100 / 1 should undergo an ophthalmic examination every 3-6 months. Treatment: Therapy for CMV retinitis consists of intravenous ganciclovir Forscarnet (cidofovir is an alternative).