A Study of an Experimental Nasal Spray in Subjects With Early Signs of the Common Cold

This study will test 200 people to see if an experimental nasal spray has an effect on symptoms of the common cold if used when the symptoms start. At the first visit to the clinic, potential subjects will have tests to make sure they qualify to participate in the study. If they qualify, they will have an equal chance of receiving the experimental nasal spray or a sham nasal spray (one that does not have the experimental formula). At the first visit, subjects will receive their assigned nasal spray and use it once at the clinic. They will also receive a booklet called a diary. Subjects will take the rest of their treatments for day 1 at home, and for the next six days, they will use the nasal spray four times per day and record their symptoms in the diary, as instructed. Then subjects will come back to the clinic for a final visit.