An Effort to Isolate Mycobacterium bovis from Environmental Substrates during Investigations of Bovine Tuberculosis Transmission Sites (Cattle Farms and Wildlife Areas) in Michigan, USA

Table 2

General characteristics of bovine TB-positive farms selected for environmental sampling.

Farm number	Farm type	Herd size	Farm size	% Purchased	Fence line contact	Other livestock	Pets
		No. Adults	Acres				Dogs/Cats
101	Beef feeder	31	110	100	No	No	Yes
102	Dairy	79	428	0	No	No	Yes
103	Cow/calf	37	102	100	No	No	Yes
104	Cow/calf	40	128	100	No	No	No
105	Cow/calf	108	330	- - - - -*	Yes	No	Yes
106	Cow/calf	103	540	- - - - -*	No	Horses	Yes
107	Cow/calf	23	188	5	No	Chickens	Yes
108	Dairy	239	500	100	No	No	Yes
109	Cow/calf	19	80	>50	No	Chickens	Yes
110	Cow/calf	48	300	25	No	Horses/sheep	Yes
111	Cow/calf-feeder	14	244	<5	No	Chickens	Yes
112	Dairy	68	65	<5	No	No	Yes
113	Dairy	148
	Average:	73.62	251.25

*Farm 105 and 106 were TB positive before the study period.