Preliminary diagnosis of<unk>  infection is usually based on clinical presentations of symptoms, places and dates of travel, activities, and epidemiological history of the location where infection occurred. Definitive diagnosis is typically made in a laboratory by employing some combination of blood tests, particularly immunologic, serologic and/or virologic techniques such as ELISA, complement fixation, polymerase chain reaction, neutralization test, and hemagglutination-inhibition test. Classification In the past,<unk> es were organized into one of four groups: A, B, C, and D. Group A denoted members of the genus Alphavirus, Group B were members of the genus Flavivirus, and Group C remains as the Group C serogroup of the genus Orthobunyavirus. Group D was renamed in the mid-1950s to the Guama group and is currently the Guama serogroup in the genus Orthobunyavirus. Currently, viruses are jointly classified according to Baltimore classification and a virus-specific system based on standard biological classification. With the exception of the African swine fever virus, which belongs to the Asfarviridae family of viruses, all major clinically important<unk> es belong to one of the following four groups: * Order Bunyavirales (Baltimore class V) * Genus Banyangvirus * Huaiyangshan banyangvirus * Genus Orthobunyavirus * Bunyamwera virus * California encephalitis virus * Jamestown Canyon virus * La Crosse encephalitis virus * Genus Orthonairovirus * Crimean–Congo hemorrhagic fever virus * Genus Phlebovirus * Heartland virus * Rift Valley fever virus * Toscana virus * Family Flaviviridae (Baltimore class IV) * Genus Flavivirus * Mosquito-borne viruses * Dengue virus group * Dengue virus * Japanese encephalitis virus group * Japanese encephalitis virus * Murray Valley encephalitis virus * St. Louis encephalitis virus * West Nile virus * Spondweni virus group * Spondweni virus * Zika virus * Yellow fever virus group * Yellow fever virus * Tick-borne viruses * Mammalian tick-borne virus group * Kyasanur forest disease virus * Tick-borne encephalitis virus * Family Reoviridae (Baltimore class III) * Subfamily Sedoreovirinae * Genus Orbivirus * African horse sickness virus * Bluetongue disease virus * Epizootic hemorrhagic disease virus * Equine encephalosis virus * Genus Seadornavirus * Banna virus * Subfamily Spinareovirinae * Genus Coltivirus * Colorado tick fever virus * Family Togaviridae (Baltimore class IV) * Genus Alphavirus * Chikungunya virus' * Eastern equine encephalitis virus * Ross River virus * Venezuelan equine encephalitis virus * Western equine encephalitis virus
Arbovirus
Oncovirus
Coronavirus 
Coronavirus
Echovirus
Senecavirus
Orthohantavirus
Pandoravirus