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Table 1 Number of reported HPAIV H5N1 infected premises (IPs) by flock size and flock mortality categories for Period I (i.e. pre-vaccination period) and Period II (i.e. post-vaccination period) outbreak periods.

From: Evaluating the control of HPAIV H5N1 in Vietnam: virus transmission within infected flocks reported before and after vaccination

 

Pre vaccination IPs

Post vaccination IPs

 

Chicken

Duck

Mixed

Other

Chicken

Duck

Mixed

Other

Total number(proportion)

318(0.32)

577 (0.57)

72 (0.07)

38(0.04)

13(0.11)

91(0.8)

4(0.04)

6(0.05)

No. of birds initially at risk(proportion)

        

1-50 head

58(0.18)

27(0.05)

8 (0.11)

0

7(0.54)

18(0.2)

3(0.75)

6(1)

51-200 head

77(0.24)

96(0.17)

25 (0.35)

1(0.03)

2(0.15)

23(0.25)

0

0

201-500 head

74(0.23)

152(0.26)

22 (0.31)

0

0

18(0.2)

1(0.25)

0

501-1,000 head

46(0.14)

154(0.27)

11 (0.15)

0

1(0.08)

18(0.2)

0

0

1,001-1,500 head

21(0.07)

76 (0.13)

1 (0.01)

1(0.03)

2(0.15)

7(0.08)

0

0

1,501-3,000 head

21(0.07)

55 (0.10)

1 (0.01)

6(0.16)

0

6(0.07)

0

0

3,001-6,000 head

15(0.05)

13 (0.02)

2 (0.03)

10(0.26)

0

1(0.01)

0

0

>6,000 heads

6(0.02)

4 (0.01)

2 (0.03)

20(0.53)

1(0.08)

0

0

0

No. of birds reported dead (proportion)

        

1-20 head

58(0.18)

37(0.06)

9(0.13)

0

9(0.69)

25(0.27)

4(1)

6(1)

21-50 head

67(0.21)

82(0.14)

20(0.28)

1(0.03)

1(0.08)

21(0.23)

0

0

51-150 head

71(0.22)

145(0.25)

24(0.33)

0

0

16(0.18)

0

0

151-300 head

50(0.16)

123(0.21)

6(0.08)

10(0.26)

0

12(0.13)

0

0

301-500 head

36(0.11)

87(0.15)

5(0.07)

4(0.11)

1(0.08)

6(0.07)

0

0

501-1,000 head

18(0.06)

63(0.11)

5(0.07)

5(0.13)

1(0.08)

7(0.08)

0

0

>1,001 head

18(0.06)

40(0.07)

3(0.04)

18(0.47)

1(0.08)

4(0.04)

0

0