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Table 1 Prevalence of avian influenza virus in different types of samples from surveillance system

From: Risk factors for avian influenza virus in backyard poultry flocks and environments in Zhejiang Province, China: a cross-sectional study

Types Sum Prevalence (%)
A H5 H7 H9 H5/H7/H9
Poultry samples 2778 124 (4.46) 6 (0.22) 21 (0.76) 36 (1.30) 57 (2.05)
 Feces 2734 110 (4.02) 6 (0.22) 19 (0.69) 28 (1.03) 49 (1.79)
 Anal swabs 14 2 (14.29) 0 (0) 0 (0) 0 (0) 0 (0)
 Throat swabs 16 6 (37.5) 0 (0) 0 (0) 6 (37.5) 6 (37.5)
 Feather swabs 14 6 (42.86) 0 (0) 2 (14.29) 2 (14.29) 2 (14.29)
Environment samples 1760 89 (5.06) 3 (0.17) 47 (2.67) 24 (1.36) 58 (3.30)
 Cage swabs 814 43 (5.28) 3 (0.37) 18 (2.21) 13 (1.60) 23 (2.83)
 Environmental surface swabs 50 9 (18.00) 0 (0) 5 (10.00) 4 (8.00) 9 (18.00)
 Drinking water samples 648 14 (2.16) 0 (0) 7 (1.08) 5 (0.77) 7 (1.08)
 Sewage samples 98 9 (9.18) 0 (0) 6 (6.12) 2 (2.04) 8 (8.16)
 Crib swabs 122 0 (0) 0 (0) 0 (0) 0 (0) 0 (0)
 Chopping board swabs 28 14 (50.00) 0 (0) 11(39.29) 0 (0) 11(39.29)
  Total 4538 213 (4.69) 9 (0.20) 68 (1.50) 60 (1.32) 115 (2.53)
  χ2 0.8474 26.7553 0.0379 6.7464
  P-value 0.3573 1.000a < 0.0001 0.8457 0.0094
  1. a Fisher exact test