This list includes 5 Viruses that start with U that begin with U, from “Umatilla virus” to “Uukuniemi virus”. They are mostly arthropod-associated or environmental viruses commonly used in surveillance, diagnostics, and laboratory research.

Viruses that start with U are viruses whose established common names begin with the letter U. One notable example, Uukuniemi virus, played a role in early tick-borne virus research.

Below you’ll find the table with Classification, Affects humans?, Symptoms, Transmission, Notes, Citations, and Last updated.

Classification: Shows family, genus and species so you can quickly understand viral relationships and clinical relevance.

Affects humans?: Indicates whether the virus infects people and how commonly, helping you assess clinical importance.

Symptoms: Lists common clinical features in brief phrases, so you can recognize typical presentations quickly.

Transmission: Summarizes main spread routes so you understand outbreak risks and prevention priorities.

Notes: Gives context like reservoirs, vectors, or lab-use notes that add practical interpretation for you.

Citations: Provides sources and references so you can follow up on original taxonomy or clinical reports.

Last updated: Shows the most recent review date so you know how current the information is.

Viruses that start with U

NameClassificationAffects humans?Transmission
Usutu virusFlaviviridae / Flavivirus / Usutu virusYes — zoonotic; primarily birds, occasional human casesMosquito vector: Culex spp.; bird-mosquito transmission cycle
Una virusTogaviridae / Alphavirus / Una virusYes — zoonotic; regional human infections reported in South AmericaMosquito-borne (arbovirus); New World mosquito vectors
Uukuniemi virusPhenuiviridae / Uukuvirus / Uukuniemi virusNo — tick-associated; rare/limited human links reportedTick-borne (hard ticks, Ixodidae)
Umbre virusPeribunyaviridae / Orthobunyavirus / Umbre orthobunyavirusNo — isolated from mosquitoes; human pathogenicity unclearMosquito-borne (various genera) in field isolates
Umatilla virusReoviridae / Orbivirus / Umatilla virusNo — primarily wildlife/arthropod virus; no confirmed human diseaseArthropod-borne (mosquitoes or biting midges) in field isolates

Descriptions

Usutu virus
Mosquito-borne flavivirus causing large bird die-offs; rare human infections cause fever, rash, headache, encephalitis. First identified in Africa, emerged in Europe.
Una virus
Alphavirus in South America causing febrile illness; symptoms include fever, rash, joint pain, occasional neurologic disease. Low-profile but monitored in endemic regions.
Uukuniemi virus
Tick-borne bunyavirus mainly in Europe/Asia; rarely linked to mild febrile illness in humans. Used as a research model; symptoms: rare mild fever, headache, myalgia.
Umbre virus
Orthobunyavirus first isolated in India from mosquitoes; not established as a major human pathogen. Symptoms: not well-characterized; occasional febrile reports.
Umatilla virus
Orbivirus detected in North American arthropods and vertebrates; veterinary/ecological interest more than human health impact. Symptoms in humans: none reported.
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