Giuseppe
Emeritus
[Source: US Centers for Disease Control and Prevention (CDC), full page: (LINK). Edited.]
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Reported Infections with Variant Influenza Viruses in the United States since 2005
When people are infected with influenza A viruses that are known to be genetically similar to viruses circulating in swine, these viruses are called ?variant viruses? and denoted with a letter ?v?.
As of August 24, 2012, 312 cases of infection with variant influenza viruses have been reported in the United States since 2005.
Of these 312 cases, 13 have been H1N1v viruses, 297 have been H3N2v viruses and 2 have been H1N2v viruses.
All 312 persons infected with variant viruses recovered from their illness.
Most cases occurred in children (persons 18 or younger) and most cases reported direct or indirect exposure to swine prior to onset of illness.
Limited transmission from close contact with an infected person has been observed in some investigations of human infections with variant viruses, but sustained human-to-human transmission has not been documented.
Beginning in August 2011, infection with an H3N2v virus was detected in a number of people across several U.S. states.
More information about H3N2v is available at Influenza A (H3N2) Variant Virus Outbreaks.
Table. Case Count: Detected U.S. Infections with Variant Influenza Viruses by State since December 2005
[Reporting State - H3N2v ? H1N1v ? H1N2v - Total Detected Influenza Variant Virus infections]
For more detailed information about previously detected human cases of variant influenza infection, see Reports of Human Infections with Variant Viruses
-When people are infected with influenza A viruses that are known to be genetically similar to viruses circulating in swine, these viruses are called ?variant viruses? and denoted with a letter ?v?.
As of August 24, 2012, 312 cases of infection with variant influenza viruses have been reported in the United States since 2005.
Of these 312 cases, 13 have been H1N1v viruses, 297 have been H3N2v viruses and 2 have been H1N2v viruses.
All 312 persons infected with variant viruses recovered from their illness.
Most cases occurred in children (persons 18 or younger) and most cases reported direct or indirect exposure to swine prior to onset of illness.
Limited transmission from close contact with an infected person has been observed in some investigations of human infections with variant viruses, but sustained human-to-human transmission has not been documented.
Beginning in August 2011, infection with an H3N2v virus was detected in a number of people across several U.S. states.
More information about H3N2v is available at Influenza A (H3N2) Variant Virus Outbreaks.
Table. Case Count: Detected U.S. Infections with Variant Influenza Viruses by State since December 2005
[Reporting State - H3N2v ? H1N1v ? H1N2v - Total Detected Influenza Variant Virus infections]
- Hawaii ? 1 ? ? ? ?
- Illinois ? 4 ? 1 ? ?
- Indiana ? 140 ? ? ? ?
- Iowa ? 4 ? 3 ? ?
- Kansas ? 1 ? ? ? ?
- Maine ? 2 ? ? ? ?
- Maryland ? 12 ? ? ? ?
- Michigan ? 5 ? ? ? 1
- Minnesota ? 4 ? 2 ? 1
- Missouri ? ? ? 1 ? ?
- Ohio ? 98 ? 2 ? ?
- Pennsylvania ? 11 ? ? ? ?
- South Dakota ? ? ? 1 ? ?
- Texas ? ? ? 1 ? ?
- Utah ? 1 ? ? ? ?
- West Virginia ? 5 ? ? ? ?
- Wisconsin ? 9 ? 2 ? ?
- Total ? 297 ? 13 ? 2 ? 312
For more detailed information about previously detected human cases of variant influenza infection, see Reports of Human Infections with Variant Viruses
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