Fate of Tubercle Bacilli Outside the Animal Body Classic Reprint

Excerpt from Fate of Tubercle Bacilli Outside the Animal Body

The fact that one-tenth of all deaths in the human family are due to tuberculosis, and that millions of dollars worth of farm animals are lost annually from its ravages, makes any knowledge concerning the fate of tubercle bacilli outside of the animal body of great value.

These questions have often come from stock owners: How long is it necessary to keep healthy stock from a field where tuber~ culons cattle have been previously allowed to run? How long do tubercle bacilli live in manure, in a watering trough, and in a dead tuberculous animal? And again, some authors have questioned the reports in the literature that tubercle bacilli remain alive and viru lent for periods of a year and more outside of the animal body. They have Suspected that in such cases the tubercles, found in the test animals after inoculation with such tuberculous material, kept for these long periods, had been produced by dead tubercle bacilli. It has been, in part, the purpose of this bulletin to answer these questions.

The first section is devoted to brief notes on the biology of the tubercle bacillus; then a tabular review of the literature is given with brief discussions; and lastly an account of the experimental work, followed by a general discussion. The experiments deal with pure cultures of tubercle bacilli, and with those of some other bacteria for purposes of comparison as to their duration of life in sunlight and under desiccation; and with the time limit of life of tubercle bacilli in cow manure, garden soil, water, butter, and dead tuberculous animals.

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