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A strain of Drosophila melanogaster bearing the mutant gene ebony has been found to slow the development of symptoms (carbon dioxide sensitivity) in adult flies inoculated with sigma virus, a member of the rhabdovirus group. This inhibition is made evident by comparing mean incubation times of the virus in ebony and wild-type (Oregon) flies. The increase in mean incubation time in ebony flies has ranged from about 3 to 8 days, depending on the virus strain, amount of virus injected, and the age of the flies at the time of inoculation. This delay in development of symptoms appears to be due to a dominant autosomal gene, although further work is needed to confirm this. When accumulation of infectious virus after inoculation is compared in ebony and Oregon flies, there seems to be no inhibition of multiplication in ebony at the level of the entire fly. The relationship of this work to current theories on the mechanism of symptom production by sigma virus is discussed.

A NEW STRAIN OF DROSOPHILA THAT INHIBITS THE DEVELOPMENT OF SYMPTOMS IN IMAGOES INFECTED WITH SIGMA VIRUS