The systematic campaign, begun in 1917, to eradicate tuberculosis from livestock in the United States has resulted in extensive, and often spirited, discussions of many features of this work. With the testing of cattle now proceeding at the rate of approximately a million animals monthly, wide public interest and comment are naturally to be expected. Much of the discussion has related to the menace of bovine tuberculosis to the human population. This subject has a strong popular appeal, and without doubt the human-health factor has been responsible for much of the support given to the campaign.