<p><strong>Fig. 1.4.</strong> (<strong>D</strong>) A transmission electron microscope image of <em>Influenza</em> <em>A</em> H1N1 flu virus particles shows the detail of their small structures.</p>

Fig. 1.4. (D) A transmission electron microscope image of Influenza A H1N1 flu virus particles shows the detail of their small structures.

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