Risk of Shiga Toxigenic Escherichia coli O157:H7 Infection from Raw and Fermented Milk in Sokoto Metropolis, Nigeria

Table 2

Frequency of Escherichia coli isolates from raw and fermented milk samples.

	Number of samples positive for Escherichia coli	Number of samples negative for Escherichia coli	Total
Raw milk	15	157	160
Fermented milk	9	98	100
Total	24	236	260

χ² = 0.010, p = 0.919, OR = 1.05, (95% CI: 0.44–2.49), OR: odds ratio, and CI: confidence interval.