Upper respiratory infections don't seem to transmit by contact that much. They do, but not as much as through the air. Stomach diseases are more likely to be tr

Upper respiratory infections don't seem to transmit by contact that much. They do, but not as much as through the air. Stomach diseases are more likely to be transmitted this way. But there may be some correlation. Closed doors possibly means poor ventilation. Also, more doors to touch can mean being more active and in contact with more people.