Dick, Dick and Williams,8 studying an epidemic of enteritis in infants in which the mortality was 30.7 per cent, found that postmortem material from early cases showed B. coli and green-producing streptococci in the blood streams and in the pus from the mastoids. They also found green-producing streptococci predominating in the throat cultures of ill and well infants and believed that the streptococci isolated from the mastoids were similar to those found in the throats of the ill and well infants. From these findings they concluded, "Since both green-producing streptococci and the colon bacillus are normally present in infants, their presence in the exudates and blood stream at death did not furnish sufficient basis for the assumption that either was the primary cause of the epidemic."
This conclusion is apparently based on the premise that any microorganism found frequently in normal persons cannot be the etiologic factor in an infection.
III. STOOL CULTURES. Am J Dis Child. 1934;47(3):606-612. doi:10.1001/archpedi.1934.01960100132017