<p><strong>SF Fig. 1.4.</strong> (<strong>A</strong>) A transmission electron microscope image shows the <em>Influenza</em> A H1N1 virus.</p>

SF Fig. 1.4. (A) A transmission electron microscope image shows the Influenza A H1N1 virus.

Image courtesy of Cynthia Goldsmith, Centers for Disease Control and Prevention (CDC)