<a href="https://en.wikipedia.org/wiki/Charles_Armstrong_(physician)" class="extiw" title="en:Charles Armstrong (physician)">Charles Armstrong</a> (1886 – 1967), American virologist in his laboratory.
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external free" href="https://ihm.nlm.nih.gov/images/B01920">https://ihm.nlm.nih.gov/images/B01920</a>