The Nasal Mucus Index (NMI) compared with nasal interleukin (IL) 8 and polymorphonuclear neutrophils (PMN) allocation. Categories and units: IL-8, each category represents 1000 pg/mL; PMN, each category represents 100 neutrophils counted per 4 mm2; NMI, each category represents the categorical severity classification. Data represents day 3 measurements. Day 3 measurements were similar to day 1 measurements. Day 3 measurements had slightly higher acute respiratory infection (ARI) severity and, therefore, were chosen to display in this visual representation.