Influenza A Virus Posted by Shayna Matson Full size 1214 × 862 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. Next image Leave a Reply Cancel replyYour email address will not be published.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