Table 2: Effectiveness of maintenance therapy using oral IV ganciclovir in delaying first progression of cytomegalovirus (CMV) retinitis

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                                              Cooperative
                                              Study         Rachlis
                               Drew et al(8)  Group(10)     et al(23)

                                IV   Oral     IV   Oral     IV   Oral

Mean time to first progression
of CMV retinitis (days)         62   57       66   54       62   51

Patients with deterioration 
of visual acuity(%)             25   20       16   19       11   16

Note: The number of patients in the three studies were 121, 225 and
159; and their median CD4+ counts were 9.5 cells/mm3, 7 cells/mm3 and
10 cells/mm3, respectively.