Table I.

Swine influenza (H1N1) pneumonia: clinical case definitions in adults

Definite H1N1 pneumonia (laboratory criteria)

ILIs with temperatures >102°F, severe myalgias, and a CXR with no focal/segmental lobar infiltrates, plus one or more of these positive tests:

• Rapid influenza A test

• Respiratory FA viral panel

• RT-PCR for H1N1

Probable H1N1 pneumonia (clinical criteria)

ILIs with temperature >102°F, severe myalgias, and a CXR with no focal/segmental lobar infiltrates with negative influenza tests (see above), plus:†

• Otherwise unexplained relative lymphopenia

• Elevated CPKs

• Increased serum transaminases (SGOT/SGPT)

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