The common cold is a viral infection of the upper respiratory tract.

The common cold is an easily spread infection of the upper respiratory tract.

It can also damage the skin and upper respiratory tract.

The substance may be toxic to upper respiratory tract, skin, eyes.

The upper tracts are under permanent cover of snow.

Vapor may be irritating to the eyes and upper respiratory tract.

It has also been proposed for surgery of the upper urological tract.

The establishment of the upper respiratory tract is initiated at birth.

Sometimes these spread to the upper tract in the kidney, which is called pyelonephritis.

Relationship between blood groups and tumours of the upper urinary tract.