tetano
Editor, Senior Moderator
Novel influenza A viruses that normally circulate in animals may infect humans. Following discussion among international human and animal health agencies, these viruses will now be referred to as ?variant influenza viruses? and, as an abbreviation going forward, will be designated with a ?v?; recent examples include A(H3N2)v, A(H1N1)v, and A(H1N2)v. In the second half of 2011, a number of U.S. residents were found to be infected with influenza A variant viruses, especially A(H3N2)v. Investigations have revealed human infections with these viruses following contact with swine as well as limited human-to-human transmission. While this virus has been detected in U.S. swine, it's unknown how widespread it is. It's possible that sporadic infections and even localized outbreaks among people with this virus will continue to occur. While there is no evidence that sustained human to human transmission is occurring, all influenza viruses have the capacity to change and it's possible that this virus may become widespread. So far, the severity of illnesses associated with this virus has been similar to the severity of illnesses associated with seasonal flu virus infections. Limited serologic studies indicate that adults may have some pre-existing immunity to this virus while children do not. CDC is closely monitoring human infections with all novel influenza viruses, including H3N2v viruses, and will provide more information as it becomes available.
Additional documents slated for posting today, December 23, 2011.
Information for Schools & Childcare Providers
Guidance for School Administrators to Help Reduce the Spread of Seasonal Influenza in K-12 Schools
Detected U.S. Human Infections with Influenza A(H3N2)v Viruses by state since July 2011
Reporting States H3N2v
Indiana
2
Iowa
3
Maine
2
Pennsylvania
3
West Virginia
2
This chart indicates the number of CDC-reported human infections with variant influenza A viruses since July 2011. The following states have reported cases: Indiana (2), Iowa (3), Maine (2), Pennsylvania (3), and West Virginia (2).
http://www.cdc.gov/flu/swineflu/influenza-variant-viruses.htm
Additional documents slated for posting today, December 23, 2011.
Information for Schools & Childcare Providers
Guidance for School Administrators to Help Reduce the Spread of Seasonal Influenza in K-12 Schools
Detected U.S. Human Infections with Influenza A(H3N2)v Viruses by state since July 2011
Reporting States H3N2v
Indiana
2
Iowa
3
Maine
2
Pennsylvania
3
West Virginia
2
This chart indicates the number of CDC-reported human infections with variant influenza A viruses since July 2011. The following states have reported cases: Indiana (2), Iowa (3), Maine (2), Pennsylvania (3), and West Virginia (2).
http://www.cdc.gov/flu/swineflu/influenza-variant-viruses.htm