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Viral hemorrhagic fever caused by hantaviruses is an emerging infectious disease for which suita-ble treatments are not available. In order to improve this situation a better understanding of han-taviral pathogenesis is urgently required. Hantaviruses infect endothelial cell layers in vitro with-out causing any cytopathogenic effect and without increasing permeability. This implies that the mechanisms underlying vascular hyperpermeability in hantavirus-associated disease are more complex and that immune mechanisms play an important role. In this review we highlight the lat-est developments in hantavirus-induced immunopathogenesis. A possible contribution of neutro-phils has been neglected so far. For this reason, we place special emphasis on the pathogenic role of neutrophils in disrupting the endothelial barrier.