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<!--
  MODIFIED HTML Basics Example

  Level: BeginneeRRRRRRRr

  Author: Kevin Browne
-->
<!DOCTYPE html>
<html>
  <head>
    <title>Common Cold</title>
  </head>
  <body>

    <h1>Common Cold</h1>

    <p>The common cold is a <strong>viral infectious disease</strong> of the <em>upper respiratory tract</em>.</p>

    <img src="https://upload.wikimedia.org/wikipedia/commons/9/9f/Illu_conducting_passages.svg" width="200" alt="respiratory tract"/>

    <hr />

    <h2>Symptoms</h2>

    <p>The typical symptoms of a cold include cough, runny nose, sneezing, nasal congestion, and a sore throat.</p>

    <p>Other symptoms include:</p>

    <ul>
      <li>muscle ache</li>
      <li>fatigue</li>
      <li>headache</li>
      <li>loss of appetite</li>
    </ul>

    <hr />

    <h2>Causes</h2>

    <h3>Viruses</h3>

    <p>The common cold can be caused by many different viruses, including:</p>

    <ol>
      <li>rhinovirus (~30-80%)</li>
      <li>coronaviruses (~15%)
      <li>influenza viruses (~10-15%)</li>
    </ol>

    <h3>Transmission</h3>

    <p>The common cold virus can be transmitted via airborne droplets.</p>  <br />

    <p>The common cold may be transmitted via contaminated objects.</p>

    <hr />

    <h2>More Information</h2>

    <p>Read the <a href="https://en.wikipedia.org/wiki/Common_cold" target="_blank">common cold Wikipeida article</a> for more information.</p>

  </body>
</html>