"Colds slowed reaction times by 36 milliseconds. Yet consuming the amount of alcohol that would lead to a driving ban slows reactions by just 15 milliseconds."
While the physical symptoms of a cold are well known, researchers are increasingly looking at the effects it has on mental functioning.
In the study, 50 people with a cold were tested and the results then compared to results for a group who were not infected over the same three-month period.
Results show that alertness was reduced by a third in cold sufferers. The effects did not seem to be altered by the severity of the cold.
Other studies have suggested that when the body fights infection, it may affect the levels of key chemicals in the brain, causing changes in mood, memory and movement.
Prof Smith says: "People who drive when they have a cold need to know the risks."
- DAILY MAIL