Seeing Red (IMAGE) Arizona State University Caption This image shows an upregulation of cytokines, indicated in red. Comparison of common influenza (A/Texas/39/21), two pathogenic 1918 ressortant strains (1918HA/NA:A/Texas/36/91 and 1918HA/NA/NS/:A/Texas/36/91) and A/Vietnam/1203/2004—a Highly Pathogenic Avian Influenza (HVAI) known as H5N1. Credit PNAS Usage Restrictions From full access PNAS article figure License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.