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Current H1N1 Activity
The week ending June 20, 2009, MDCH began aggregate flu reporting which includes flu-like illness and confirmed and probable cases of seasonal and novel influenza. This report, below, will be updated every Tuesday by 5:00 p.m. A confirmed case of novel influenza A (H1N1) virus infection is defined as a person with an influenza-like illness (ILI) who tests positive for novel influenza A (H1N1) by RT-PCR as performed by the MDCH Bureau of Laboratories or a commercial laboratory with a validated PCR test. A probable case is defined as a person with an ILI who tests positive with either a commercial novel influenza A H1 PCR test that has not been validated by the MDCH Bureau of Laboratories or who tests positive for influenza A, but is negative for seasonal influenza H1 and H3 by RT-PCR.