| 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 |