Duvenhage lyssavirus is a rabies-related virus within the genus Lyssavirus first identified in South Africa after a fatal human case in 1970 following a bat bite. It has a negative-sense single-stranded RNA genome and bullet-shaped enveloped particles like other lyssaviruses and is transmitted primarily by bites or scratches from insectivorous bats.
Virology and epidemiology
Duvenhage lyssavirus (DUVV) belongs to the Lyssavirus genus, which comprises viruses that cause acute progressive encephalitis known as rabies. DUVV contains an approximately 12 kb negative-sense RNA genome encoding five structural proteins, and its virions are bullet-shaped with surface glycoprotein spikes, similar to those of other lyssaviruses. The virus was discovered in 1970 when a person bitten by an unidentified insectivorous bat in South Africa developed a rabies-like disease and died. Subsequent surveillance recovered DUVV from insectivorous bats such as Miniopterus schreibersi and Nycteris thebaica. These bats are thought to be the natural reservoirs. Human exposure occurs through bites or scratches. There is no evidence of person-to-person transmission and only two human infections have been documented: the 1970 index case and a case in 2006. The virus is endemic to southern Africa and has not been reported elsewhere. Routine rabies vaccines may provide incomplete cross-protection, so post-exposure prophylaxis is recommended after bat contact.
Rare cases and bat surveillance
The paucity of Duvenhage virus infections underscores its rarity. In the 1970 index case, the patient developed acute neurological disease after a bat bite and succumbed to encephalitis. In 2006 a 77-year-old man scratched by a bat developed fever, neck and limb rigidity, seizures and died 14 days after illness onset. These cases highlight the severe outcomes associated with DUVV infections. Field investigations in the 1980s identified the virus in free-ranging insectivorous bats including Miniopterus schreibersi and Nycteris thebaica, confirming bats as reservoirs. Because human infections are exceedingly rare, surveillance focuses on bat populations and awareness among people working in caves or handling bats.
The combination of a very limited human case history and confirmed bat reservoirs makes Duvenhage lyssavirus one of the least understood lyssaviruses. Public health responses centre on rapid wound cleansing and timely administration of rabies post-exposure prophylaxis after bat contact, even in regions where classical rabies is not present. Better surveillance of bat populations and genetic studies are required to clarify the virus’s distribution and its relationship to other lyssaviruses.
Related Terms: Rabies Lyssavirus, Lagos Bat Lyssavirus, Mokola Lyssavirus, Rotavirus H, Colorado Tick Fever Virus