Chronic medical conditions, presenting signs and symptoms, laboratory testing, and chest X-ray results among persons with fatal and non-fatal influenza A(H5N1) virus infections.

N/a: not applicable;*unadjusted OR and 95% CI of a fatal H5N1 outcome among H5N1 cases;†dyspnea: defined as any recorded difficulty breathing or shortness of breath in any age group, or in a child less than age 5, the presence of stridor or chest in-drawing;§altered mental status: defined as any recorded presence of altered mental status, confusion, or unconsciousness;¶pneumonia: defined as the presence of alveolar infiltrates, interstitial infiltrates, or lobar consolidation on chest X-ray;**not possible to calculate an unadjusted OR.