Influenza A Virus Posted by Shayna Matson Full size 1246 × 894 pixels Playdoh Model for Antigen Presenting Pathway and Immunodominance 1. The Influenza A virus has a glycoprotein called hemagglutinin (HA) that covers the surface of the virus. HA allows the virus to enter and infect cells by binding to the cell’s surface. Previous image Next image Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *CommentName* Email* Website Save my name, email, and site URL in my browser for next time I post a comment. Δ