New Bagaza virus outbreak in red-legged partridges in Spain and appearance in Portugal and other birds.

Two studies analyze the Bagaza virus outbreaks in birds that took place for the second time in Southern Spain in 2019 and for the first time in Portugal in 2021. The data confirm that co-infection of this flavivirus and avian malaria parasites is the cause of the high mortality observed in the affected populations of red-legged partridge.