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Most clinical influenza tests are able to identify the type of influenza virus
causing infection: type A or type B. However, these tests cannot distinguish the
subtype of influenza A virus present; therefore, a seasonal influenza A(H3) or
A(H1) infection would not be differentiated from avian influenza A(H5). Using a
clinical influenza test that identifies seasonal influenza A subtype can help
identify if an infection with seasonal influenza A is present or not. If a seasonal
influenza test capable of subtyping detects influenza A, but no subtype is
identified, the virus detected might be avian influenza A(H5).
causing infection: type A or type B. However, these tests cannot distinguish the
subtype of influenza A virus present; therefore, a seasonal influenza A(H3) or
A(H1) infection would not be differentiated from avian influenza A(H5). Using a
clinical influenza test that identifies seasonal influenza A subtype can help
identify if an infection with seasonal influenza A is present or not. If a seasonal
influenza test capable of subtyping detects influenza A, but no subtype is
identified, the virus detected might be avian influenza A(H5).