Common cold Cause Transmission
Viruses may than be transmitted from the hands to the eyes or nose where infection occurs. People sitting close together appear at greater risk of becoming infected. Transmission is common in daycare and at school, due to the closeness of many children with little immunity and frequently poor hygiene. These infections are then brought home to other members of the family. There is no evidence that the air on commercial flights transmits cold viruses. Rhinoviruses are most infectious in the first three days of cold symptoms. They are much less infectious afterwards.