A Study of the Persistence of Mycobacterium bovis in the Environment under Natural Weather Conditions in Michigan, USA

Table 3

Mean duration in days of M. bovis persistence in the environment on corn, hay, water and soil samples in season “A”, “B”, and “C” in shaded and nonshaded conditions.

	Shade mean (Std. Dev.)	No shade mean (Std. Dev.)	t statistic	P-value
Fall/Winter “A”	12.79 (12.27)	9.58 (9.38)	−1.68	.10
Winter/Spring “B”	18.40 (20.65)	17.41 (20.48)	−0.20	.84
Spring/Summer “C”	7.18 (12.52)	2.38 (4.03)	−1.48	.15