Illustration of <a href="https://en.wikipedia.org/wiki/antigenic_shift" class="extiw" title="w:antigenic shift">antigenic shift</a>
<ul><li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Mouagip" title="User:Mouagip">Mouagip</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:AntigenicShift_HiRes.png" title="File:AntigenicShift HiRes.png">AntigenicShift HiRes.png</a>: <a href="https://en.wikipedia.org/wiki/National_Institute_of_Allergy_and_Infectious_Diseases" class="extiw" title="w:National Institute of Allergy and Infectious Diseases">National Institute of Allergy and Infectious Diseases</a> (NIAID).</li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:AntigenicShift_HiRes.png" title="File:AntigenicShift HiRes.png">AntigenicShift HiRes.png</a></li></ul>