1.   Ether is irritant to the mouse respiratory tract and can cause excessive mucous secretion.

2.   It is another remedy with an affinity for the respiratory tract.

3.   Subjects who developed a symptomatic infection of the upper respiratory tract were retested while ill and again one month later when asymptomatic.

4.   The cilia in the respiratory tract hasten the exit from the body of possibly harmful foreign material.

5.   Upper respiratory tract infections, especially acute otitis media, are the most important determinants for the development of an effusion.

6.   We are not aware of reports from developing countries of the outcome of hypoxaemia in children with acute lower respiratory tract infection.

7.   When inhaled, these very small clusters are deposited in the respiratory tract.

8.   With further respiratory tract infections there remains a tendency to impaired hearing, but this is transient.

9.   Certainly smoking stimulates mucin secretion by the respiratory tract mucosa, probably by a direct irritant effect.