Danielbaileyonline

Convalescent carriers are persons who harbor the organism, sometimes for many years, after recovery from a disease, e.g. typhoid bacilli have been recovered from the gall-bladder 25 years after an attack of typhoid fever. In consequence there have been notorious carriers, who were responsible for many epidemics over a period of years.

The organisms causing tetanus, gas gangrene and botulism are normally found in cultivated soil.