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New Swine Flu Outbreak: Case Count Rising

145 Cases in People So Far, 90% Are Kids
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WebMD Health News
Reviewed by Louise Chang, MD

Aug. 9, 2012 -- The case count in the ongoing outbreak of new swine flu has jumped from 12 cases last week to at least 145 cases, the CDC announced today.

Even while the CDC was making the announcement, Indiana health officials reported seven new cases. That brings the total to 152 cases -- and counting.

Dubbed H3N2 variant or H3N2v, the virus causing the outbreak is a swine flu bug that more easily infects humans than the swine flu viruses previously circulating in pigs. All cases this year are in people who had direct contact with live pigs. You cannot get the virus from eating pork.

When the virus first appeared last year, there were a few cases of very limited human-to-human spread. There's been no person-to-person spread so far this year, Joseph Bresee, MD, of the CDC's Influenza Division, today said at a news conference.

"There is no sign of an increase in overall flu activity. This is not a pandemic situation," Bresee said.

Even so, case counts are rising in Indiana, now reporting 120, and in Ohio, now reporting 30. Since the outbreaks began, there have also been single cases in Hawaii and in Illinois. Bresee said the CDC would not be surprised to see outbreaks in other states.

"We expect to see more cases next week," he said.

Nine out of 10 cases are in children. That could be because children have been exposed to fewer flu bugs and vaccinated less often than adults. Or it could be because nearly all pig exposures have come at state, county, and local agricultural fairs, where children typically show off the animals they have raised.

Typically, only six or seven people a year come down with swine flu from pigs. This year may be different because H3N2v has picked a gene from the 2009 pandemic flu virus that may allow it to better infect humans.

The seasonal flu vaccine does not protect against H3N2v swine flu. Fortunately, the new swine flu is no more dangerous than typical seasonal flu. So far this year there have been only two hospitalizations and no deaths from the new flu bug.

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