JAMA. 1909;LII(19):1501. doi:10.1001/jama.1909.02540450033007.
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The fact that persons who have suffered from typhoid fever, and even those who have never had an attack of illness clinically recognizable as this disease, may carry typhoid bacilli in their excreta for years, has been widely recognized only recently. Like all new discoveries, there has been a tendency to overestimate its importance, but it seems fairly certain from recent German work that at least 5 per cent. of typhoid patients become bacillus carriers. This means that the percentage of bacillus carriers among those who have not had typhoid fever is much smaller than this. Nevertheless even this apparently small percentage of bacillus carriers must mean a great many infectious individuals in a country where typhoid fever is as prevalent as in the United States. The view that seemed to gain ground for a while, that except in widespread outbreaks the majority of cases were due to bacillus carriers


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