c. COMMON COLD SYMPTOMS: The Wisconsin Upper Respiratory Symptom Survey (WURSS-24) will be used to assess common cold illness severity and symptoms (see attached questionnaire). Scores from the WURSS-24 include: 1) Global severity score; 2) Symptom score; 3) Function ability score (Barrett et al., 2009). The WURSS-24 (short version to be used in this study) includes 10 items assessing symptoms (running nose, plugged nose, sneezing, sore throat, scratchy throat, cough, hoarseness, head congestion, chest congestion, feeling tired), 9 items assessing functional impairments (think clearly, sleep well, breathe easily, walk-climb stairs-exercise, accomplish daily activities, work outside the home, work inside the home, interact with others, live your personal life), and 1 item assessing global severity and global change. Subjects will fill in the one-page WURSS-24 at the end of each day during the 12-week monitoring period. This 12-week period will cover the winter and early spring period of 2014. From the responses recorded during the 84-day study, an ARI severity score will be calculated by summing the daily ARI global severity score (0=not sick, 1=very mild ARI to 7=severe). The ARI symptom score for the 84-day period will be calculated by summing all 10 symptom scores for each day's entry (0=do not have this symptom, 1=very mild to 7=severe). In similar fashion, the ARI function ability score for the 84-day period will be calculated by summing all 9 function scores for each day's entry (0=do not have this symptom, 1=very mild to 7=severe). Separate scores will be calculated comparing groups for each illness episode recorded by the subjects.