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In the Paris letter in The Journal, February 27, page 739, it was said that the guinea-pig is not susceptible to the bovine type of tubercle bacillus. According to the standard textbooks on bacteriology, guinea-pigs inoculated with the bovine type of tubercle bacillus die more quickly and show more extensive lesions than those infected with human bacilli. The bovine type is said to be more virulent for all the ordinary laboratory animals than is the human.
Bovine Tubercle Bacilli and Guinea-Pigs. JAMA. 1937;108(20):1723. doi:10.1001/jama.1937.02780200045018