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Through the years, since its discovery, the tuberculin test has developed into a valuable means of discovering the trail of persons infected with tubercle bacilli. In spite of many studies of its value, many physicians still neglect the tuberculin test when the differential diagnosis of a pulmonary lesion is considered. The reasons for neglect of the tuberculin test appear to be manifold. First, there seems to be a feeling that "since nearly every adult is tuberculin-positive, there is little reason to do the test." Secondly, newer procedures in diagnosing lesions of the lungs are stressed, such as different positions of roentgenography, bronchoscopy, bronchography, cultures of tubercle bacilli, hemagglutination tests for tuberculosis, and laminography. The physician may become involved in the intricacies of the new tests rather than attempt to evaluate his patient on the basis of tried and true ones. Thirdly, the present-day treatment for tuberculosis has become so simplified

Summary Mumps virus was isolated from the saliva 7 days prior to the onset of parotitis in a boy with natural mumps infection. This report of the isolation of mumps virus during the incubation period of natural infection agrees with the finding of salivary shedding of virus following experimental infection with a low egg passage, virulent strain of mumps virus. 5