t M . fermentans, M . salivarium, M . hominis type I, M . hominis type 11, and the FH strain of M . pneumoniae were provided by Drs. N. L. Somerson and R. M. Chanock, Nat. Inst. Health, Bethesda, Md.

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A longitudinal serologic study of M. pneumoniae infections in two recruit training centers with grossly different climates showed that the frequency of this infection peaks in the late summer-early fall and to a lesser degree in the spring at both training centers. Seroconversions (four-fold or greater increase in titer) were as high as 45-57% in some recruit companies during the late summer peak. M. pneumoniae isolations from men admitted to the dispensary or hospital with pneumonia during the major peak season were as high as 32%. While M. pneumoniae infections are not generally life-threatening, the high incidence of infections observed in personnel during recruit training is of major concern and warrants consideration of effective control measures.

Lakes Naval Training Center are reported. The efficacy of various vaccines was examined and the results are presented. Related to these is a report on an epidemiologic study of respiratory disease among recruits at the Naval Training Center and the Marine Corps Recruit Depot at San Diego, which showed that methods of handling the men and the environment in which they are placed are closely related to respiratory illness rates.