Typhoid is now recognized as a carrier disease. Therefore the possibilities of distribution are enormously increased over those in diseases having no carrier state. They are increased because a healthy carrier has contact with those about him over a long period. This contact, under favorable conditions of transmission, inevitably means infection of susceptible persons.
The last typhoid outbreak in Washington (1922) was of carrier origin. Its salient points are as follows:
About 400 persons attended a church supper. In forty-four of these typhoid developed, and four died. In the resultant investigation by the department of health, all foods served at the supper, except one, were ruled out as sources of typhoid infection. This was the potato salad; this one food had been eaten by all those taken sick. The dressing used in this salad was eliminated from suspicion, because it had been boiled. It was evident, then, that the potatoes
CUMMING JG. SHOULD THE BARRIERS AGAINST TYPHOID BE CONTINUED?. JAMA. 1932;98(2):93-95. doi:10.1001/jama.1932.02730280001001