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Double-stranded RNA is a molecule rarely found in a cell, but it is specific for viral infection. It is also a substrate of ADAR enzymes. These enzymes convert adenosin to inosine, which is recognized as guanosine by cellular machinery. Apart from editing activity, ADAR enzymes interact with cellular proteins, such as Dicer and protein kinase R, which together with editing affects viral replication. In this work, the information about antiviral activity of ADAR enzymes and their impact on infection of selected primarily human viruses is reviewed.