Coronavirus Atomic model gathered by X-ray crystallography of influenza hemagglutinin (center, red), the protein on the surface of the influenza virus that is largely responsible for its infectivity, bound to two human antibodies (left and right, purple), the body’s method of flagging invasive agents in the body for elimination. SHARE IMAGE: Download Image: Full Size (0.33 MB) Photo By: Walter Reed Army Institute of Research VIRIN: 200317-O-ZZ999-1111M.JPG Photo Gallery