tetano
Editor, Senior Moderator
This document provides updated interim guidance for state and local health departments conducting investigations of infections with influenza A (H3N2) variant [(H3N2)v] viruses. The following case definitions are for the purpose of investigations of suspected, probable, and confirmed cases of influenza A (H3N2)v virus infection. CDC is requesting notification of all suspected and probable cases of influenza A (H3N2)v virus infection within 24 hours of identification. When possible, state health departments are encouraged to investigate suspected cases of influenza A (H3N2)v virus infection further to determine case status.
Case Definitions for Infection with Influenza A (H3N2)v Virus
A suspected case of influenza A (H3N2)v virus infection is defined as acute respiratory illness (ARI) in a person who:
Is epidemiologically linked to a confirmed case of influenza A (H3N2)v virus infection (see below).
OR
Has had illness onset within 7 days of swine exposure.
Acute respiratory illness (ARI) is defined as recent onset of at least two of the following:
Rhinorrhea or nasal congestion
Sore throat
Cough
Fever or feverishness
A probable case of influenza A (H3N2)v virus infection is defined as ARI in a person who:
Had a specimen tested using the CDC Human Influenza Virus real-time reverse-transcriptase polymerase chain reaction (rRT-PCR) Diagnostic Panel and is positive for InfA, pdmInfA, and H3; and negative for InfB, pdmH1, and H1.
OR
Is epidemiologically linked to a confirmed case of influenza A (H3N2)v, and for whom results of influenza diagnostic testing of an appropriate respiratory specimen are positive for influenza A (H3) or positive for influenza A (no subtype tested or detected).
A confirmed case of influenza A (H3N2)v virus infection is defined as influenza A (H3N2)v virus infection in a person that is laboratory-confirmed at CDC.
http://www.cdc.gov/flu/swineflu/case-definitions.htm
Case Definitions for Infection with Influenza A (H3N2)v Virus
A suspected case of influenza A (H3N2)v virus infection is defined as acute respiratory illness (ARI) in a person who:
Is epidemiologically linked to a confirmed case of influenza A (H3N2)v virus infection (see below).
OR
Has had illness onset within 7 days of swine exposure.
Acute respiratory illness (ARI) is defined as recent onset of at least two of the following:
Rhinorrhea or nasal congestion
Sore throat
Cough
Fever or feverishness
A probable case of influenza A (H3N2)v virus infection is defined as ARI in a person who:
Had a specimen tested using the CDC Human Influenza Virus real-time reverse-transcriptase polymerase chain reaction (rRT-PCR) Diagnostic Panel and is positive for InfA, pdmInfA, and H3; and negative for InfB, pdmH1, and H1.
OR
Is epidemiologically linked to a confirmed case of influenza A (H3N2)v, and for whom results of influenza diagnostic testing of an appropriate respiratory specimen are positive for influenza A (H3) or positive for influenza A (no subtype tested or detected).
A confirmed case of influenza A (H3N2)v virus infection is defined as influenza A (H3N2)v virus infection in a person that is laboratory-confirmed at CDC.
http://www.cdc.gov/flu/swineflu/case-definitions.htm