The prevention of respiratory tract infections in industry.

Complications of the Common Cold I N A relatively short period of time the symptoms subside, but the virus of the cold may have had a very definite effect upon the membranes of the respiratory tract. The respiratory membranes are normally good barriers against infection by the ordinary bacteria which may be present in the mouth and throat, and on this account are part of our normal resistance to infection by these bacteria. A common effect of the cold virus on the respiratory membranes is to reduce or destroy temporarily this resistance to infection. When this happens, and the common bacteria are permitted to attack the depleted or altered membranes, we experience the complications Or sequelae of the cold. The Prevention of Respiratory Tract Infections -In Industry-