This list includes 4 Viruses that start with X that begin with X, organized from “XBB” to “XMRV”. These entries are uncommon in naming but include notable research and human-related examples. They are relevant for research, diagnostics, and public health surveillance.
Viruses that start with X are virus species or strains whose official names begin with the letter X. One notable example, XMRV, drew attention for a disputed link to chronic fatigue syndrome before that association was retracted.
Below you’ll find the table with Virus, Classification, Affects humans?, Common symptoms, and Transmission method.
Virus: The virus name helps you find the entry and match it to literature, reports, or diagnostic records.
Classification: Use taxonomy to see family, genus, or species so you understand related viruses and clinical relevance.
Affects humans?: Yes/No answer with a brief qualifier tells you quickly whether the virus infects people and in what context.
Common symptoms: Short list of typical clinical features helps you quickly match presentations and prioritize differential diagnoses.
Transmission method: Clear transmission mode tells you how the virus spreads and helps you assess exposure risk and prevention priorities.
Viruses that start with X
| Name | Classification | Affects humans? | Transmission | Description |
|---|---|---|---|---|
| XE | Coronaviridae / Betacoronavirus / Severe acute respiratory syndrome-related coronavirus | Yes (respiratory human pathogen) | Respiratory droplets/aerosols, close contact | SARS-CoV-2 recombinant lineage first detected 2022; monitored for transmissibility and immune escape, causes typical COVID-19 respiratory illness. |
| XBB | Coronaviridae / Betacoronavirus / Severe acute respiratory syndrome-related coronavirus | Yes (respiratory human pathogen) | Respiratory droplets/aerosols, close contact | Recombinant Omicron-derived SARS-CoV-2 lineage with enhanced immune escape; associated with breakthrough infections and global surveillance attention. |
| XBC | Coronaviridae / Betacoronavirus / Severe acute respiratory syndrome-related coronavirus | Yes (respiratory human pathogen; recombinant) | Respiratory droplets/aerosols, close contact | SARS-CoV-2 recombinant reported in 2022 (Delta–Omicron mix); detected in surveillance though not dominant globally. |
| XMRV | Retroviridae / Gammaretrovirus / Xenotropic murine leukemia-related virus | No | No human transmission; laboratory contamination | Discovered 2006 and linked to prostate cancer and chronic fatigue in early studies, later shown to be a laboratory contaminant, not an established human pathogen. |