Oct 9, 2009 4:10 pm US/Central
CDC: H1N1 Cases Are Increasing Nationally
ATLANTA (CBS) ―
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A woman arrives at the Los Angeles International Airport wearing a protective mask to shield herself from the H1N1 virus.
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Health officials say swine flu activity is picking up, with 37 states now reporting widespread cases.
Officials with the federal Centers for Disease Control and Prevention reported Friday that the count is up from 27 states the previous week. The figures suggest a leveling off of flu activity the previous week may have been short-lived.
Meanwhile, CDC officials say states have ordered 3.6 million doses of swine flu vaccine for a campaign that started this week.
Although H1N1 is closing schools in places like Texas and Virginia, other regions are still waiting for the virus to show up again, reports CBS News.
"We're not seeing H1N1 influenza in New York City right now," Dr. Thomas Farley, the New York City health commissioner told CBS News.
CDC data shows last spring, New York and New Jersey were especially hard hit but have been relatively spared this fall. The opposite is true of the Southeast, which saw fewer cases last spring but is now seeing an H1N1 surge, reports CBS News medical correspondent Dr. Jon LaPook.
"One of the current ideas is that that wave of this virus last spring has left a number of people protected who are immune from the virus," said Dr. Martin Blaser, the chair of medicine at NYU Langone Medical Center.
This protective effect is called herd immunity.
"In places like New York and the Northeast, there's probably a substantial amount of herd immunity, which is dampening the spread of the virus," Blaser said. "It doesn't mean it's not going to appear. It just means that it's going to appear later, and maybe not quite as bad as it is in the Southeast right now."
Experts say the best way to increase herd immunity is vaccination. The CDC says that even if you think you had H1N1 last season, you cannot be absolutely sure unless you were specifically tested and most people were not. The CDC recommends getting the vaccine if you're in a subgroup for which it's advised.
(© 2010 CBS Broadcasting Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)
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