The Rational Clinical Examination
David L. Simel, Drummond Rennie
Influenza
David L. Simel, W. Paul McKinney
Make the Diagnosis: Influenza
Topics Discussed:
criterion standard comparisons (diagnostic tests), influenza, likelihood ratio, make the diagnosis, prior probability, probability
Excerpt:
"Clinicians must rely on informed clinical judgment to determine
the prior probability of influenza, which requires an understanding
of the epidemiology weekly reports for influenza, available from
the CDC (for the United States, http://www.cdc.gov/flu/weekly/,
and for International surveillance, http://www.cdc.gov/flu/weekly/intsurv.htm;
accessed June 1, 2008) that applies to your population. For US data,
the CDC reports the frequency of influenza-like illness during influenza
season and whether influenza virus is present in your region. However,
they do not report whether a given patient with an influenza-like
illness is likely to have influenza...."
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