Whooping cough is more often a serious disease of infancy and early childhood than is commonly believed. Recent epidemiologic studies by Sundal1 of Stockholm and by Gundel and Schlüter2 of Heidelberg, based on the last five annual epidemiologic reports of the League of Nations, show that it now causes death of more children under 5 years of age than does diphtheria, measles or scarlet fever. In children under 2, it causes more deaths than do these three diseases combined. The mortality of afflicted infants less than 1 year old may reach 15 per cent. The league's report shows that in 1932 more than 300,000 cases of the disease were reported in the United States. The average age at which it is contracted is about 4 years; the peak is often reached during the second or third year of life. About four-fifths of our annual 6,000 or more deaths
SAUER LW. IMMUNIZATION AGAINST WHOOPING COUGH. Am J Dis Child. 1935;49(1):69–71. doi:10.1001/archpedi.1935.01970010078007
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