Hemagglutinin and Neuraminidase are the proteins of the Type A flu. Hemagglutinin allows the virus to enter a host cell (remember, virus is must have the cellular mechanics of a host) and Neuraminidase allows the virus to reproduce and exit...going on to infect another cell. To date, antiviral agents attack Neuraminidase (Neuraminidase inhibitors). New research outlined in Medical News Today, highlights the possibility of attacking both the H and the N. See the article here: In A New Way Of Treating The Flu, Both The H And N Portions Of The Virus Are Targeted
This would be good news for all of us as virus begin to become resistant to medications such as Tamiflu.