On June 11, 2009 Dr Margaret Chan, the director general of the World Health Organization (WHO) declared that the H1N1 flu that was then spreading around the world was an official pandemic. This triggered a series of built-in responses in many countries, including stockpiling anti-viral medications and preparing for a mass H1N1 vaccination program. At the time the flu was still in its “first wave” and the fear was that subsequent waves, as the virus swept around the world, would become more virulent and/or contagious – similar to what happened in the 1918 pandemic.
This did not happen. At least our worst fears were not realized. The H1N1 pandemic, while serious, simmered through the winter of 2009-2010, producing a less than average flu season, although with some worrisome difference.
The Centers for Disease Control (CDC) estimates:
- CDC estimates that between 43 million and 89 million cases of 2009 H1N1 occurred between April 2009 and April 10, 2010. The mid-level in this range is about 61 million people infected with 2009 H1N1.
- CDC estimates that between about 195,000 and 403,000 H1N1-related hospitalizations occurred between April 2009 and April 10, 2010. The mid-level in this range is about 274,000 2009 H1N1-related hospitalizations.
- CDC estimates that between about 8,870 and 18,300 2009 H1N1-related deaths occurred between April 2009 and April 10, 2010. The mid-level in this range is about 12,470 2009 H1N1-related deaths.