Sample selection process.

<p>Sample selection process.</p

Geographic distribution of human influenza cases.

<p>Geographic distribution of human influenza cases.</p

Age and gender distribution of sampled cases compared to all cases reported to NAIS in 28 provinces.

<p>Age and gender distribution of sampled cases compared to all cases reported to NAIS in 28 provinces.</p

Human influenza cases and deaths reported by National Avian Influenza Surveillance.

1<p>All deaths also reviewed.</p

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.

<p>N/a: not applicable;</p><p>*unadjusted OR and 95% CI of a fatal H5N1 outcome among H5N1 cases;</p>†<p>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;</p>§<p>altered mental status: defined as any recorded presence of altered mental status, confusion, or unconsciousness;</p>¶<p>pneumonia: defined as the presence of alveolar infiltrates, interstitial infiltrates, or lobar consolidation on chest X-ray;</p><p>**not possible to calculate an unadjusted OR.</p

Comparison of clinical characteristics between persons with fatal influenza A(H5N1) virus infection and fatal human influenza virus infection.

<p>N/a: not applicable;</p><p>*unadjusted OR and 95% CI of a fatal H5N1 outcome versus a fatal human influenza outcome;</p>†<p>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;</p>§<p>altered mental status: defined as any recorded presence of altered mental status, confusion, or unconsciousness;</p>¶<p>pneumonia: defined as the presence of alveolar infiltrates, interstitial infiltrates, or lobar consolidation on chest X-ray;</p><p>**not possible to calculate an unadjusted OR.</p