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Table 2 Association of different risk factors with E. coli O157:H7 occurrence at animal level

From: Occurrence of Escherichia coli O157:H7 in cattle feces and contamination of carcass and various contact surfaces in abattoir and butcher shops of Hawassa, Ethiopia

Variable Total animals examined Total animals positive (%) Fisher’s exact test p-value
Sex
 Male 138 7 (4.7) 0.63 1.0
 Female 12 0
Age
 3 years 25 2 (1.3) 4.7 0.04
 4–6 years 81 1 (0.7)
  ≥ 7 years 44 4 (2.7)
Origin
 Tula 40 2 (1.3) 5.5 0.36
 Arsi Negelle 24 3 (2)
 Wondogenet 7 0
 Hawassa 30 0
 Yirgalem 34 1 (0.7)
 Tikurwoha 13 1 (0.7)
Breed
 Crossbred 13 0 (0) 0.69 1.0
 Local (zebu) 137 7 (4.7)