Duck atadenovirus A (formerly Duck adenovirus A)[1] is a species of hemagglutinating adenovirus implicated in egg drop syndrome.

[2] The virus is or has been known by the following names:[3] Strain 127 is the strain of the virus that was isolated and studied after the outbreak of egg drop syndrome 1976, and where the identification of the exact virus was first made.

[6] The virus was renamed Duck atadenovirus A in 2013.

[citation needed] The virus genome uses the standard genetic code.

[3] Various complete genome sequences exist, including: