Health
Swine Flu: Just the Latest Chapter in a 91-Year Pandemic Era
July 1, 2009 07:43 AM - Hadley Leggett, WIRED
The current strain of H1N1 influenza, or swine flu, has people scared because it’s a novel virus that most of the population has never been exposed to. But as a group, H1N1 viruses aren’t new. They’ve been circulating since 1918, when a new strain appeared simultaneously in pigs and humans and killed 40 to 50 million people in a single year. Over the past 91 years, the virus has jumped back and forth between humans, pigs and birds — and possibly even been resurrected from a laboratory freezer. Taking a historical view of the swine flu is critical to understanding the current pandemic, and future outbreaks, argue scientists in two perspectives published Monday in the New England Journal of Medicine.
