WASHINGTON — Swine flu no longer represents a major threat to the U.S. population, because most people are immune to the virus that caused last season''s pandemic, according to USA Today.
Researchers believe that, of the 310 million people in the USA, 59 percent are now believed to be immune to pandemic H1N1 flu, the article noted.
According to the article, approximately 62 million people were vaccinated against the virus, 61 million people were infected by it and another 60 million people 57 or older carry protective antibodies against similar viruses that date back to previous pandemics.
"It''s very unlikely that the virus will explode in the fall," says Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases (NIAID), and an author of the analysis. "We now have evidence of that."
The evidence comes from studies on the 2009-2010 pandemic carried out by the Centers for Disease Control and Prevention (CDC). If this virus follows the pattern set by earlier flu bugs, it will either die out completely or continue to circulate in the ever-shrinking pool of people still susceptible to it, the article stated.
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