At the Babies' Hospital there are patients with respiratory diseases in the wards at all seasons. The number commences to increase during the latter part of September and during October, rises steadily during November and December, reaches the highest point in January, remains high through February and March, then gradually declines during April and May to reach the lowest point in June, and stays low until the middle of September. The combined curve for the last five years, illustrating the incidence of the respiratory diseases at the hospital, is graphically shown in the accompanying chart. Parallel curves for each of the last five years are also shown. It can be seen that the highest point reached at any time from March 1, 1915, to March 1, 1920, was in 1917, when seventy cases of respiratory disease were admitted to the wards during March. Since the statistics for the city as
WOLLSTEIN M, SPENCE RC. THE BACILLUS OF PFEIFFER IN INFLAMMATIONS OF THE RESPIRATORY TRACT IN CHILDREN. Am J Dis Child. 1920;19(6):459–468. doi:10.1001/archpedi.1920.01910240049005
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