Illustration of <a href="https://en.wikipedia.org/wiki/antigenic_shift" class="extiw" title="w:antigenic shift">antigenic shift</a>
<a href="//commons.wikimedia.org/wiki/User:Abdullah_Arfa" title="User:Abdullah Arfa">Abdullah Arfa</a>
2020-06-21 00:14:13
<span class="int-own-work" lang="en">Own work</span>