Table 3.

Multivariable logistic analysis of risk factors that were significant using univariable analysis as shown in Tables 1 and 2

Risk factors	OR	SE	z	P > |z|	95% confidence interval
Calves < 6 month	2.376	0.763	2.69	0.007	1.266	4.457
Milk plus pasture consumed	2.927	0.947	3.32	0.001	1.553	5.519
River water	2.661	0.859	3.03	0.002	1.414	5.009
Poor hygiene	2.625	0.872	2.90	0.004	1.368	5.035
Contact with domestic animals	2.599	1.241	2.00	0.045	1.019	6.627