Table II.

Rapid clinical diagnosis of H1N1 pneumonia in hospitalized adults with negative RIDTs: diagnostic swine influenza triad^∗

Definite H1N1 pneumonia diagnosis (laboratory criteria)

ILI plus one or more of these tests:

• Rapid influenza A test

• Respiratory FA viral panel

• RT-PCR for H1N1

Probable H1N1 pneumonia diagnosis

ILI with temperature >102°F and with severe myalgias CXR with no focal/segmental lobar infiltrates and negative RIDTs, plus this diagnostic triad:

• Relative lymphopenia

• Elevated serum transaminases

• Elevated CPKs

^†Diagnostic tests were negative for other viral CAP pathogens (CMV, SARS, HPS, RSV metapneumoviruses, parainfluenza viruses, and adenoviruses).

^∗otherwise unexplained.