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Duck egg drop syndrome virus (DEDSV) is a newly emerging pathogenic flavivirus isolated from ducks in China. DEDSV infection mainly results in severe egg drop syndrome in domestic poultry, which leads to huge economic losses. Thus, the discovery of ways and means to combat DEDSV is urgent. Since 2010, a remarkable amount of progress concerning DEDSV research has been achieved. Here, we review current knowledge on the epidemiology, symptomatology, and pathology of DEDSV. A detailed dissection of the viral genome and polyprotein sequences, comparative analysis of viral antigenicity and the corresponding potential immunity against the virus are also summarized. Current findings indicate that DEDSV should be a distinct species from Tembusu virus. Moreover, the adaption of DEDSV in wildlife and its high homology to pathogenic flaviviruses (e.g., West Nile virus, Japanese encephalitis virus, and dengue virus), illustrate its reemergence and potential to become a zoonotic pathogen that should not be overlooked. Detailed insight into the antigenicity and corresponding immunity against the virus is of clear significance for the development of vaccines and antiviral drugs specific for DEDSV.

Duck egg drop syndrome virus: an emerging Tembusu-related flavivirus in China