- Jaagsiekte sheep retrovirus
- Japanese B virus
- Japanese encephalitis virus
- Japanese iris necrotic ring virus
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- Japanese soil-borne wheat mosaic virus
- Japanese yam mosaic virus
- JC polyomavirus
- JC virus
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- Johnson grass mosaic virus
- Johnsongrass chlorotic stripe mosaic virus
- Johnsongrass mosaic virus
- Jugra virus
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- Juncopox virus
- Junonia coenia densovirus
- JunÃn virus
- Jutiapa virus
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