| Abbreviations | Meaning |
 | MSV | Monkey Sarcoma Virus |
| MSV | Muir Springs Virus |
| MSV | Murine Sarcoma Virus |
| MTBV | Marituba Virus |
| MTRV | Matruh Virus |
| MTV | Mammary Tumor Virus |
| MTV | Mibuna Temperate Virus |
| MTV | Mild Tigre Virus |
| MTV | Mouse Mammary Tumor Virus |
| MUCV | Mucambo Virus |
| MUDV | Mudjinbarry Virus |
| MUHV | Murid Herpesvirus |
| MULV | Muleshoe Virus |
| MULV, MULV | Murine Leukemia Virus |
| MUMTV | Murine Mammary Tumor Virus |
| MUNV | Munguba Virus |
| MURV | Murre Virus; Murutucu Virus |
| MUV | Mumps Virus |
| MV | Measles Virus |
| MV | Microvirus, Microvirus |
| MV | Minute Virus |
| MV | Mosaic Virus |
| MV | Mottle Virus |
| MV | Myeloblastosis Virus |
| MVA | Modified Vaccinia Virus Ankara |
| MVC | Minute Virus Of Canines |
| MVEV | Murray Valley Encephalitis Virus |
| MVM | Microvillose Membrane; Minute Virus Of Mice |
| MWAV | Manawa Virus |
| MWV | Manawatu Virus |
| MXV | Mexico Virus |
| MYKV | Mykines Virus |
| MYXV | Myxoma Virus |
| NA | Non-A [hepatitis Virus] |
| NAHV | Non-A Hepatitis Virus |
| NANBHV | Non-A, Non-B Hepatitis Virus |
| NANBNC | Non-A, Non-B, Non-C [hepatitis Virus] |
| NASV | Nasoule Virus |
| NBV | Nelson Bay Orthoreovirus |
| NCDV | Nebraska Calf Diarrhea Virus |
| NCHECR | National Centre In Human Immunodeficiency Virus [HIV] Epidemiology And Clinical Research [Australia] |
| NDEV | Ndelle Virus |
| NDUV | Ndumu Virus |
| NDV | Newcastle Disease Virus; Nyando Virus |
| NEDV | North End Virus |
| NEPV | Nepuyo Virus |
| NETV | Netivot Virus |
| NGAV | Ngaingan Virus |
| NGOV | Ngoupe Virus |
| NIV | Nodule-inducing Virus; Noninvasive Ventilation |
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