This list includes 31 Viruses that start with B, from “B virus” to “Bwamba virus”. These viruses vary from common human pathogens to zoonotic agents and are studied in diagnosis, treatment, and surveillance.

Viruses that start with B are a diverse group of pathogens found in humans, animals, and plants. Notable examples include Borna disease virus, historically linked to neurological outbreaks in horses and studied since the early 20th century.

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

Name: The official virus name and common aliases, helping you quickly identify which organism the row describes.

Classification: Shows ICTV family, genus, and species when available, letting you see taxonomic context at a glance.

Affects humans?: States Yes or No with a brief qualifier like ‘zoonotic’ or ‘opportunistic’, clarifying human relevance.

Symptoms: Lists common and typical symptoms in five to ten words, so you can recognize likely clinical presentations.

Transmission: Summarizes the principal transmission route in concise terms, helping you quickly understand how the virus commonly spreads.

Notes: Short remarks on reservoirs, notable outbreaks, or clinical relevance to add practical context for clinicians and researchers.

References: Cites primary sources like ICTV, CDC, WHO, or PubMed entries so you can verify and read further.

Last updated: Date of the most recent update, letting you assess currency of the information at a glance.

Viruses that start with B

NameClassificationAffects humans?Transmission method
B virusHerpesviridae / Simplexvirus / Macacine alphaherpesvirus 1Yes zoonoticbite or saliva exposure
BK polyomavirusPolyomaviridae / Betapolyomavirus / BK polyomavirusYes primaryrespiratory and urine transmission
Barmah Forest virusTogaviridae / Alphavirus / Barmah Forest virusYes primarymosquito-borne (Aedes spp.)
Batai virusPeribunyaviridae / Orthobunyavirus / Batai orthobunyavirusYes zoonoticmosquito-borne
Bunyamwera virusPeribunyaviridae / Orthobunyavirus / Bunyamwera orthobunyavirusYes zoonoticmosquito-borne
Bombali ebolavirusFiloviridae / Ebolavirus / Bombali ebolavirusNo unknownunknown
Bwamba virusPeribunyaviridae / Orthobunyavirus / Bwamba orthobunyavirusYes primarymosquito-borne
Banna virusReoviridae / Seadornavirus / Banna virusYes zoonoticmosquito-borne
Borna disease virus 1Bornaviridae / Orthobornavirus / Mammalian 1 orthobornavirusYes zoonoticlikely contact with infected animals
Bundibugyo virusFiloviridae / Ebolavirus / Bundibugyo ebolavirusYes zoonoticcontact with bodily fluids
Buffalopox virusPoxviridae / Orthopoxvirus / Buffalopox virusYes zoonoticdirect contact with lesions or fomites
Bluetongue virusReoviridae / Orbivirus / Bluetongue virusNo primarily animalvector-borne (Culicoides midges)
Bovine viral diarrhea virusFlaviviridae / Pestivirus / Pestivirus ANo primarily animalcontact and vertical transmission
Bovine alphaherpesvirus 1Herpesviridae / Varicellovirus / Bovine alphaherpesvirus 1No primarily animalrespiratory and contact transmission
Bovine leukemia virusRetroviridae / Deltaretrovirus / Bovine leukemia virusNo primarily animalbloodborne, milk, iatrogenic
Bocavirus (Human bocavirus 1)Parvoviridae / Bocaparvovirus / Human bocavirus 1Yes primaryrespiratory droplets, fecal–oral
Beak and feather disease virusCircoviridae / Circovirus / Beak and feather disease virusNo primarily animalcontact and feather dust
Beluga whale coronavirus SW1Coronaviridae / Gammacoronavirus / Beluga whale coronavirus SW1No primarily animalunknown; marine mammal transmission
Bayou virusHantaviridae / Orthohantavirus / Bayou orthohantavirusYes zoonoticrodent excreta inhalation
Bovine coronavirusCoronaviridae / Betacoronavirus / Betacoronavirus 1No primarily animalfecal–oral and respiratory
Bovine ephemeral fever virusRhabdoviridae / Ephemerovirus / Bovine ephemeral fever virusNo primarily animalvector-borne (biting insects)
Bovine respiratory syncytial virusPneumoviridae / Orthopneumovirus / Bovine orthopneumovirusNo primarily animalrespiratory droplets, close contact
Bovine foamy virusRetroviridae / Spumaretrovirus / Bovine foamy virusNo primarily animalclose contact, saliva exposure
Black queen cell virusDicistroviridae / Cripavirus / Black queen cell virusNo primarily animalcontact within hives, fecal contamination
Bean common mosaic virusPotyviridae / Potyvirus / Bean common mosaic virusNo primarily animalaphid-borne and seed transmission
Bean yellow mosaic virusPotyviridae / Potyvirus / Bean yellow mosaic virusNo primarily animalaphid-borne and seed transmission
Beet necrotic yellow vein virusBenyviridae / Benyvirus / Beet necrotic yellow vein virusNo primarily animalsoil-borne via plasmodiophorid vectors
Banana bunchy top virusNanoviridae / Babuvirus / Banana bunchy top virusNo primarily animalaphid-borne (Pentalonia nigronervosa)
Barley yellow dwarf virusLuteoviridae / Luteovirus / Barley yellow dwarf virus complexNo primarily animalaphid-borne
Brome mosaic virusBromoviridae / Bromovirus / Brome mosaic virusNo primarily animalaphid-borne, mechanical transmission
Bovine parvovirusParvoviridae / Protoparvovirus / Bovine parvovirusNo primarily animalfecal–oral and direct contact

Descriptions

B virus
Symptoms: fever, headache, confusion, seizures, paralysis; macaque reservoir, causes severe encephalitis with high mortality if untreated
BK polyomavirus
Symptoms: asymptomatic, hemorrhagic cystitis, kidney dysfunction in immunosuppressed; latent in kidneys, important in transplant patients
Barmah Forest virus
Symptoms: fever, rash, joint pain, fatigue; Australian mosquito-borne illness causing prolonged joint pain
Batai virus
Symptoms: fever, headache, muscle pain, sometimes neurological signs; detected in mosquitoes and livestock, zoonotic risk
Bunyamwera virus
Symptoms: fever, headache, vomiting, rash, rare encephalitis; widespread mosquito-borne virus affecting humans and animals
Bombali ebolavirus
Symptoms: unknown in humans; no confirmed human cases reported, found in bats with potential zoonotic significance
Bwamba virus
Symptoms: fever, headache, rash, joint pain; causes Bwamba fever in Africa, mosquito-transmitted
Banna virus
Symptoms: fever, headache, vomiting, neurological signs in some; mosquito-borne virus detected in Asia, associated with encephalitis cases
Borna disease virus 1
Symptoms: fever, confusion, encephalitis, neurologic decline; linked to fatal human encephalitis, reservoir likely shrews
Bundibugyo virus
Symptoms: fever, vomiting, diarrhea, hemorrhage, multi-organ failure; causes Ebola disease outbreaks with high fatality
Buffalopox virus
Symptoms: localized pustules, fever, swollen lymph nodes; zoonotic from infected buffalo, occupational risk for handlers
Bluetongue virus
Symptoms: fever, nasal discharge, oral lesions, swollen tongue; important ruminant disease causing severe illness in sheep and economic losses
Bovine viral diarrhea virus
Symptoms: fever, diarrhea, respiratory signs, abortions in cattle; major livestock disease causing reproductive and production losses
Bovine alphaherpesvirus 1
Symptoms: fever, nasal discharge, conjunctivitis, abortions in cattle; causes infectious bovine rhinotracheitis, major cattle respiratory disease
Bovine leukemia virus
Symptoms: often asymptomatic, lymphocytosis and lymphoma in cattle; causes enzootic bovine leukosis, economic impact on herds
Bocavirus (Human bocavirus 1)
Symptoms: cough, wheeze, fever, diarrhea in children; common pediatric respiratory and gastrointestinal pathogen
Beak and feather disease virus
Symptoms: feather loss, beak deformities, immune suppression in parrots; major avian pathogen threatening psittacine species
Beluga whale coronavirus SW1
Symptoms: respiratory signs and poor condition in belugas; identified in captive beluga whales, marine mammal relevance
Bayou virus
Symptoms: fever, muscle aches, cough, severe respiratory distress; causes hantavirus pulmonary syndrome, rodent-borne in the southern USA
Bovine coronavirus
Symptoms: diarrhea, respiratory signs in calves and cattle; common cattle pathogen closely related to some human coronaviruses
Bovine ephemeral fever virus
Symptoms: fever, lameness, stiffness, decreased milk yield; causes “three-day sickness” with short but severe illness in cattle
Bovine respiratory syncytial virus
Symptoms: cough, nasal discharge, fever, bronchiolitis in calves; important cause of bovine respiratory disease complex
Bovine foamy virus
Symptoms: usually asymptomatic; no consistent disease in cattle; widely distributed foamy virus of cattle with limited clinical impact
Black queen cell virus
Symptoms: larval death, queen cell darkening, colony decline in bees; significant honeybee pathogen affecting apiculture
Bean common mosaic virus
Symptoms: mosaic leaf patterns, stunting, yield loss in beans; widespread plant virus affecting legume crops
Bean yellow mosaic virus
Symptoms: yellow mosaic, leaf distortion, reduced yield in legumes; common pathogen of beans and peas
Beet necrotic yellow vein virus
Symptoms: yellow veins, root decay, severe yield loss in sugar beet; major agricultural virus transmitted through soil organisms
Banana bunchy top virus
Symptoms: stunted growth, bunched leaves, chlorosis in banana plants; devastating crop disease with major economic impact
Barley yellow dwarf virus
Symptoms: yellowing, stunting, reduced grain in cereals; widespread virus complex affecting cereal crops and yields
Brome mosaic virus
Symptoms: mosaic, leaf malformation, stunting in grasses; model plant virus used in research and crop pathology
Bovine parvovirus
Symptoms: diarrhea, reproductive losses in cattle; causes disease in young animals and reproductive failure in herds
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