Fiers investigated the nucleotide sequence of the hemagglutinin gene of this duck virus and found that it was indeed very closely related to the strain that started the 1968 Hong Kong outbreak.

• 菲尔斯研究了这个鸭病毒中血球凝集素基因的序列，发现它果然与1968年香港大流行的病毒非常相近。