SUMMARYDrosophila X virus described here appeared as a contaminant in Drosophila melanogaster. It is pathogenic for the inoculated flies, inducing anoxia sensitivity and death in these insects. An assay based on these symptoms in flies has been developed. Immunofluorescence has been used to study the characteristics of infected Drosophila cell cultures. A permanent infection can be established in these cultures. This virus is morphologically similar to several ungrouped vertebrate and invertebrate viruses like IPNV, IBDV and Tellina tenuis virus. Its possible origin is discussed.
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