| Abbreviations | Meaning |
 | IVR | Inhibitor Of Virus Replication |
| IVV | Influenza Virus Vaccine; Intravenous Vasopressin |
| JACV | Jacareacanga Virus |
| JAMV | Jamanxi Virus |
| JAPV | Japanaut Virus |
| JARIV | Jari Virus |
| JAV | Johnston Atoll Virus |
| JCDNV | Junonia Coenia Densovirus |
| JCPYV | JC Polyomavirus |
| JCV | Jakob-Creutzfeldt Virus; Jamestown Canyon Virus |
| JDV | Juan Diaz Virus |
| JEV | Japanese Encephalitis Virus |
| JNPV | Juncopox Virus |
| JOAV | Joa Virus |
| JOIV | Joinjakaka Virus |
| JSRV | Jaagsiekte Sheep Retrovirus |
| JSV | Jerry-Slough Virus |
| JUGV | Jugra Virus |
| JUNV | Junin Virus |
| JURV | Jurona Virus |
| JUTV | Jutiapa Virus |
| JV | Jugular Vein; Junin Virus |
| K | Kilham [virus] |
| K-MSV | Kirsten Murine Sarcoma Virus |
| KADV | Kadam Virus |
| KAIV | Kaikalur Virus |
| KAMV | Kamese Virus |
| KANV | Kannamangalam Virus |
| KARV | Karimabad Virus |
| KASV | Kasba Virus; Kasokero Virus |
| KAV | Kawino Virus |
| KBV | Kachemak Bay Virus |
| KCV | Kern Canyon Virus |
| KDV | Kadipiro Virus |
| KEDV | Kedougou Virus |
| KEMV | Kemerovo Virus |
| KENV | Kenai Virus |
| KERV | Kentucky Equine Respiratory Virus |
| KETV | Ketapang Virus |
| KEUV | Keuraliba Virus |
| KEYV | Keystone Virus |
| KFDV | Kyasanur Forest Disease Virus |
| KHAV | Khabarovsk Virus; Kharagysh Virus; Khasan Virus |
| KIMSV, KIMSV | Kirsten Murine Sarcoma Virus |
| KIMV | Kimberley Virus |
| KINV | Kindia Virus |
| KISV | Kismayo Virus |
| KKV | Kaeng Khoi Virus |
| KLAV | Klamath Virus |
| KLV | Kalanchoe Latent Virus |
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