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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