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Table 3 The determination of the LD 50 of the ORT/chicken/Shandong/2011 isolate

From: Co-infection of broilers with Ornithobacterium rhinotracheale and H9N2 avian influenza virus

Group No. Dosage Concentration No. mortality Mortality (%)
1 10 0.5 2.49 × 109 cfu/ml 10 10/10
2 10 0.5 2.49 × 108 cfu/ml 6 6/10
3 10 0.5 2.49 × 107 cfu/ml 1 1/10
4 10 0.5 2.49 × 106 cfu/ml 0 0/10
5 10 0.5 2.49 × 105 cfu/ml 0 0/10
6 10 0.5 control 0 0/10
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