Dobrava virus

Discovery and history

Dobrava virus was first isolated in 1992 from a yellow-necked field mouse trapped near the village of Dobrava in central Slovenia. The virus had previously been suspected as the cause of severe HFRS cases reported sporadically across the Balkans, but the isolation gave researchers a defined pathogen against which to characterize the clinical syndrome and survey the rodent fauna for prevalence.

Rodent reservoir

The primary reservoir is the yellow-necked field mouse (Apodemus flavicollis), a forest-dwelling rodent distributed across most of continental Europe but most abundant in the central and southeastern regions. A secondary reservoir, the striped field mouse (Apodemus agrarius), also carries Dobrava-Belgrade-virus lineages in parts of Eastern Europe. The two rodent species occupy different ecological niches (forest vs. open grassland), which produces somewhat different epidemiological patterns where they overlap.

Geographic distribution

Dobrava virus is concentrated in the Balkan peninsula — Slovenia, Croatia, Serbia, Bosnia and Herzegovina, Montenegro, Bulgaria, Greece — with documented cases also from Hungary, Romania, Czech Republic, Slovakia, and Germany. ECDC surveillance has confirmed sustained autochthonous transmission across the region.

Clinical features

The Dobrava-virus syndrome follows the classic HFRS five-phase course (febrile, hypotensive, oliguric, diuretic, convalescent) but with greater severity at each phase. Hemorrhagic manifestations are more pronounced than in Puumala virus disease — significant petechial rash, conjunctival hemorrhage, and gastrointestinal bleeding are common. Renal failure during the oliguric phase frequently requires dialysis. Case-fatality of up to 12 percent makes it the most lethal European hantavirus.

Notable outbreaks

Dobrava virus cases are typically sporadic rather than clustered. The highest case densities are reported from Slovenia, Bulgaria, and Greece. Outbreak years tied to yellow-necked field mouse population cycles do occur but are less pronounced than Puumala's vole-driven epidemic years.

Prevention

Standard rodent-exposure precautions, with the same emphasis on wet-method cleanup of accumulated rodent material in rural and forest-edge structures as for other European hantaviruses. There is no licensed Dobrava-virus vaccine.

Where Dobrava virus circulates

Documented in the following countries. Click through for country-specific context, active outbreak status, and historical cases.

Related strains

• PUUV The mildest major hantavirus and the highest-volume one in Europe. Causes 'nephropathia epidemica' in Northern and Central Europe with a case-fatality rate below 1 percent.
• HTNV The prototype hantavirus, agent of severe HFRS across East Asia and the original 'Korean hemorrhagic fever' described during the Korean War.

Synthesized from the World Health Organization Hantavirus Fact Sheet, the U.S. Centers for Disease Control and Prevention Hantavirus Disease pages, the European Centre for Disease Prevention and Control surveillance atlas, and primary epidemiological literature. Not a substitute for individual medical advice. If you have been exposed to rodents and develop symptoms, contact a healthcare professional.

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