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A confirmed case of S-OIV infection is defined as a person with an acute febrile respiratory illness with laboratory confirmed S-OIV infection at CDC by one or more of the following tests:

1. real-time RT-PCR
2. viral culture

A probable case of S-OIV infection is defined as a person with an acute febrile respiratory illness who is positive for influenza A, but negative for H1 and H3 by influenza RT-PCR

A suspected case of S-OIV infection is defined as a person with acute febrile respiratory illness with onset

* within 7 days of close contact with a person who is a confirmed case of S-OIV infection, or
* within 7 days of travel to community either within the United States or internationally where there are one or more confirmed cases of S-OIV infection, or
* resides in a community where there are one or more confirmed cases of S-OIV infection.

Infectious period for a confirmed case of swine influenza A (H1N1) virus infection is defined as 1 day prior to the case’s illness onset to 7 days after onset.

Close contact is defined as: within about 6 feet of an ill person who is a confirmed or suspected case of swine-origin influenza A (H1N1) virus infection during the case’s infectious period.

Acute respiratory illness is defined as recent onset of at least two of the following: rhinorrhea or nasal congestion, sore throat, cough (with or without fever or feverishness)

High-risk groups: A person who is at high-risk for complications of swine influenza A (H1N1) virus infection is defined as the same for seasonal influenza