The new swine flu strain, H3N2v, has shown at least some potential for human-to-human transmission in those 12 individuals, which makes it especially dangerous. Between 2009 and mid-2010, more than 17,000 people died worldwide from the highly contagious H1N1 swine flu strain, leading the World Health Organization to call the strain a pandemic.
The 12 people with the new swine flu strain live in Indiana, Iowa, Maine, Pennsylvania, and West Virginia. Officials for the Centers for Disease Control say the sample size of H3N2 infections is too small to know whether it will pose a threat to the population at large.
"It's a very small sample and it's geographically spread, which makes it more difficult to get a handle on it," says Jeffrey Dimond, a CDC spokesman. "Most of the cases have come through direct contact with the animals, through the 4H Club and that sort of thing."
In order to have a true threat of causing an epidemic or pandemic, Dimond says the virus needs to spread easily between humans.
"If you're in close contact with someone who's ill, that's one thing," he says. "To make it like the pandemic flu of a few years ago, it has to be highly contagious from human to human."
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