Case Definitions for Infection with Swine Influenza A (H1N1) Virus
Ministry of Health, NHCC, 28th April 2009, 1530 hrs
Confirmed case A confirmed case of swine influenza A (H1N1) virus infection is defined as a person with an acute respiratory illness with laboratory confirmed swine influenza A (H1N1) virus infection by one or more of the following tests:
•real-time RT-PCR •viral culture •four-fold rise in swine influenza A(H1N1) virus specific neutralising Antibodies
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Probable case
A probable case of swine influenza A (H1N1) virus infection is defined as a person with an acute respiratory illness with an influenza test that is positive for influenza A, and has developed symptoms within 7 days of travel to an area of concern OR A probable case of swine influenza A (H1N1) virus infection is defined as a person with an acute respiratory illness with an influenza test that is positive for influenza A, and is considered to be a close contact of a probable or confirmed case
Suspected case A suspected case of swine influenza A (H1N1) virus infection is defined as a person with an acute respiratory illness who has developed symptoms within 7 days of travel to an area of concern OR A suspected case of swine influenza A (H1N1) virus infection is defined as a person with an acute respiratory illness who is considered to be a close contact of a probable or confirmed case.
Close contact Close contact is defined as having cared for, lived with, or had direct contact with respiratory secretions or bodily fluids of a probable or confirmed case.
Acute respiratory illness For the purpose of these case definitions, an acute respiratory illness is defined as: •Recent onset of at least 2 of the following: 1. Rhinorrhoea or nasal congestion 2. Sore throat 3. Cough 4. Fever or feverishness OR •Influenza-like illness: fever >37.8°C plus cough or sore throat Area of concern An area of concern is any country so defined by the Ministry of Health
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