Variables Total Examined No of positive Prevalence (%) Χ2 P- Value 95% CI Age       0.279 0.597 0.584-1.363 >70 weeks 200 61 30.50       < 70 weeks 193 64 33.16       Breed       1.789 0.409 0.416-1.211 WLH 309 98 31.72       Fiam 40 10 25.00       Local 44 17 38.64       Sex             Male 218 69 31.65 0.002 0.963 0.659-1.847 Female 175 56 32 Production level             55-80 eggs/year 349 108 31.00 0.983 0.321 0.377-1.379 280 eggs/year 44 17 38.64 WLH: White leg horn; Χ2: Chi-square.

Table 2: Association between different potential risk factor and sero-positivity.