Swine influenza diagnostic criteria

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Diagnostic Criteria

Case Definitions for Infection with Swine-Origin Influenza A (H1N1) Virus

• A confirmed case of swine-origin influenza A (H1N1) virus infection is defined as an acute febrile respiratory illness in a person and laboratory-confirmed swine-origin influenza A (H1N1) virus infection at CDC by either of the following tests:

• Real-time reverse transcrition--polymerase chain reaction (rRT-PCR)

OR

• Viral culture

• A probable case of swine-origin influenza A (H1N1) virus infection is defined as acute febrile respiratory illness in a person who is:

• Positive for influenza A, but negative for H1 and H3 by influenza rRT-PCR.

• A suspected case of swine-origin influenza A (H1N1) virus infection is defined as acute febrile respiratory illness in a person:

• With onset within 7 days of close contact with a person who has a confirmed case of swine-origin influenza A (H1N1) virus infection

OR

• With onset within 7 days of travel to a community, either within the United States or internationally, which has one or more confirmed swine-origin influenza A (H1N1) cases

OR

• Who resides in a community in which one or more confirmed swine-origin influenza cases have occurred