CORRESPONDENCE. 
Perth, West Australia, June 29, 1912. 
Editors American Veterinary Review, New York: In 
a recent number of the American Veterinary Review I no¬ 
ticed that one writer referred to the continued infection of a herd, 
and remarked that there appeared to be a “ Typhoid Mary ” 
amongst the herd which he was unable to locate by means of the 
tuberculin test. The history of a little “ Typhoid Mary ” of mine 
may prove of interest. She was an old brown Jersey cow be¬ 
longing to a milkman in the Metropolitan area, whose herd I 
tested with P. D. & Co.’s tuberculin in February, 1911. Follow¬ 
ing inoculation the temperatures were taken on the 12th, 15th 
and 18th hours, when 50 per cent, of the herd reacted, but the old 
brown cow was not amongst them. At this time she showed no 
clinical evidence of disease, and was in fair order for a milking 
cow. In November, 1911, I ag*ain inspected the herd, and ex¬ 
amined all the udders manually. Old “ Brownie ” showed a small 
fibrous thickening extending up from a supernumary teat at the 
back of the udder, and she was again tested, together with an old 
cow that had previously reacted, and another unthrifty brute. 
The latter gave a marked reaction and was subsequently slaught¬ 
ered, but neither of the two former showed any appreciable rise 
in their temperatures, which were taken at the same periods as 
before. The following April I went through the herd. Once 
more I found old “ Brownie ” with a typical induration of one 
hind quarter of toe udder, accompanied by enlargement of the 
supra-mammary lymphatics. She was immediately condemned 
and on slaughter proved to be extensively infected with tubercu¬ 
losis, practically all the glands, even down to the popliteal, being 
diseased, while the pleura was covered with “ grapes,” and one 
horn of the uterus, with its accompanying ovary, was also' in¬ 
volved. Although the disease was widely distributed throughout 
her body, I have seen cattle in a worse state give a pronounced re¬ 
action to tuberculin. As an illustration I append the temperature 
record of the worst case I ever post-mortemed: Pre-inoculation, 
101; 12th, 105.4; 15th, 104.4; 18th, 103—hour temperatures. At 
the time I laid violent hands on her, old “ Brownie ” was looking 
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