Table 3.
H9N2 human serology studies.
| Country | Dates Sampled | Occupational Exposure | Percent Positiv (%) | General Exposure | Percent Positive (%) | HI Cutoff | Occupational Exposure | Percent Positive (%) | General Exposure | Percent Positive (%) | MN Cutoff | Ref. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| China 1 | 1999 | 0/54 | 0 | 1/110 | 0.91 | 1600 | [87] | |||||
| Vietnam 1 | 2001 | 1/200 | 0.5 | 0/200 | 0 | 1/40 | [72] | |||||
| UnitedStates 2 | 2004 | 1/385 | 0.26 | 1/484 | 0.21 | 1/40 | [64] | |||||
| China 1 | Apr. 2006–Feb. 2008 | 12/1060 | 1.1 | 0/407 | 0 | 1/160 | [80] | |||||
| Iran 1 | Nov. 2006 | 48/127 | 37.7 | 0/25 | 0 | 1/20 | [86] | |||||
| UnitedStates 2 | Mar. 2007–Apr. 2008 | 4/93 | 4.3 | 1/78 | 1.28 | 1/10 | [82] | |||||
| China 1 | Mar. 2007–Jul. 2008 | 95/1890 | 5.03 | 4/301 | 1.33 | 1/20 | [73] | |||||
| China 1 | Jan. 2008–Dec. 2010 | 103/840 | 12.47 | 47/1663 | 2.83 | 1/40 | 1/20 | [54] | ||||
| Cambodia 3 | Apr. 2008–Oct. 2008 | 21/777 | 2.7 | 1/10 | [60] | |||||||
| Thailand 3 | Apr. 2008–Oct. 2010 Enrollment |
38/800 | 4.7 | 1/10 | [88] | |||||||
| 12 Month | 21/768 | 2.7 | 1/10 | [68] | ||||||||
| 24 Month | 40/784 | 5.1 | 1/10 | |||||||||
| Nigeria 2 | Dec. 2008–Jun. 2009 | 4/316 | 1.27 | 0/54 | 0 | 1/10 | [61] | |||||
| United States 2 | 2009–2010 | 1/157 | 0.63 | 0/78 | 0 | [65] | ||||||
| China 1 | 2009–2011 | 1912/14,896 | 12.8 | 1/40 | 453/14,896 | 3.04 | 1/40 | [85] | ||||
| 489/13,453 | 3.6 | 159/13,453 | 1.18 | |||||||||
| Romania 2 | Feb. 2009–Jan. 2010 | 31/312 | 0.7 | 2/51 | 3.92 | 1/40 | 29/312 | 10.14 | 4/51 | 5.19 | 1/10 | [89] |
| China 1 | Mar. 2009–Dec. 2012 | 37/2006 | 1.8 | 0/83 | 0 | 1/160 | 24/37 | 64.86 | 0 | [74] | ||
| China 1 | May 2010 | 18/1039 | 1.73 | 1/40 | [75] | |||||||
| India 1 | Jul. 2010–Dec. 2010 | 21/338 | 6.2 | 0/249 | 0 | 1/40 | 19/338 | 5.6 | 1/40 | [70] | ||
| Iran 1 | Dec. 2010–Jul. 2011 | 3/182 | 1.6 | 0 | 0 | 1/20 | [67] | |||||
| Pakistan 1 | 2010–2011 | 165/384 | 43.0 | 1/160 | [84] | |||||||
| China 1 | Jan. 2011–Dec. 2013 | 51/600 | 8.5 | 11/600 | 1.8 | 1/40 | 51/600 | 8.5 | 11/600 | 1.8 | 1/40 | [78] |
| China 1 | Mar. 2011 | 12/1741 | 0.7 | 1/40 | [63] | |||||||
| China 1 | Dec. 2011–Feb. 2012 | 9/382 | 2.3 | 0/100 | 0 | 1/40 | 7/382 | 1.80 | 0/100 | 0 | 1/40 | [76] |
| Iran 1 | Sep. 2012–Jan. 2013 | 12/100 | 12.0 | 2/100 | 2 | 1/40 | 17/100 | 17 | 3/100 | 3 | 1/40 | [62] |
| China 1 | Oct. 2013–Jul. 2014 | 56/171 | 32.7 | 1/40 | [81] | |||||||
| China 1 | Dec. 2013–Jan. 2014 | 50/546 | 9.2 | 5/264 | 1.89 | 1/40 | [77] | |||||
| Vietnam 1 | 2013–2015 | 28/784 | 3.6 | 0 | 0 | 1/40 | [59] | |||||
| Iran 1 | not reported | 98/300 | 32.6 | 8/300 | 2.5 | 1/40 | [69] | |||||
| Iran 1 | not reported | 163/240 | 67.9 | 14/60 | 23.3 | 1/20 | [79] | |||||
| Pakistan 1 | not reported | 209/465 | 45.0 | 0/25 | 0 | 1/160 | [83] | |||||
| Egypt 1 | not reported | 0/60 | 0.0 | 1/40 | [66] |
1 H9N2 is endemic in poultry in this country. 2 H9N2 is not endemic in poultry in this country. 3 H9N2 endemic status is unknown in this country.