COMMON VIRUS INFECTIONS OF THE RESPIRATORY TRACT

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Abstract
Knowledge of certain virus infections of the respiratory tract has increased greatly within the short span of the last fifteen years. During this period two distinct types of influenza virus have been isolated and characterized,1the large group of immunologically related viruses termed the "psittacosis-lymphogranuloma" group has been more sharply delineated,2and important advances have been made in the understanding of contagious diseases, such as measles3and mumps,4which are due to viruses and are spread by secretions of the respiratory tract. These well known specific infections, however, together comprise the lesser part of the problem of virus infections of the respiratory tract. The greater part of the problem, in terms of frequency of occurrence of cases,5encompasses the group of common infections which vary in their clinical characteristics from the "common cold" to the "atypical pneumonia" and are referred to by a variety of

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