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Volume 15, Number 5—May 2009

Research

Seroprevalence of Antibodies to Avian Influenza Virus A (H5N1) among Residents of Villages with Human Cases, Thailand, 20051

Rapeepan DejpichaiComments to Author , Yongjua Laosiritaworn, Pilaipan Phuthavathana, Timothy M. Uyeki, Michael O’Reilly, Nattaphon Yampikulsakul, Sumreung Phurahong, Phisanu Poorak, Jarunee Prasertsopon, Rumporn Kularb, Kannika Nateerom, Narumol Sawanpanyalert, and Chuleeporn Jiraphongsa
Author affiliations: Thai Ministry of Public Health, Nonthaburi, Thailand (R. Dejpichai, Y. Laosiritaworn, M. O’Reilly, N. Yampikulsakul, S. Phurahong, N. Sawanpanyalert, C. Jiraphongsa); Mahidol University, Bangkok, Thailand (P. Phuthavathana, P. Poorak, J. Prasertopon, R. Kularb, K. Nateerom; Centers for Disease Control and Prevention, Atlanta, GA, USA (T.M. Uyeki)

Main Article

Table 1

Characteristics of the study population, overall and by method of selection, Thailand, 2005

Characteristic Random sample 
(n = 131), no. (%) Convenience sample 
(n = 770), no. (%) p value Total sample 
(N = 901), no. (%)
Age group, y 0.30
1–14 19 (14.5) 178 (23.1) 197 (21.9)
15–29 14 (10.7) 99 (12.9) 113 (12.5)
30–44 37 (28.2) 177 (23.0) 214 (23.8)
45–59 32 (24.4) 175 (22.7) 207 (22.9)
60–74 24 (18.3) 109 (14.2) 133 (14.8)
75–89 4 (3.1) 28 (3.6) 32 (3.6)
90–104
1 (0.8)
4 (0.5)

5 (0.5)
Occupation 0.04
Plant farmer 59 (45.0) 236 (30.6) 295 (32.7)
Animal farmer 3 (2.3) 11 (1.4) 14 (1.6)
Farmer (plant and animal) 2 (1.5) 7 (1.0) 9 (0.10)
Merchant 2 (1.5) 13 (1.7) 15 (1.7)
Government officer 0 3 (0.4) 3 (0.4)
Other (employee, housekeeper) 42 (32.1) 346 (44.9) 388 (43.0)
Missing
23 (17.6)
154 (20.0)

177 (19.6)
Sex 0.70
Male 58 (44.3) 324 (42.1) 382 (42.4)
Female
73 (55.7)
446 (57.9)

519 (57.6)
Risk factors 0.60
Direct or close contact with backyard poultry 
 (including chickens) 89 (67.9) 525 (68.2) 614 (68.1)
Direct or close contact with backyard chickens 86 (65.6) 519 (67.4) 605 (67.1)
Direct or close contact with dead/sick chicken 36 (27.5) 196 (25.5) 232 (25.7)
Close contact with a person with a confirmed case
 of avian influenza A
13 (9.9)
51 (6.6)

64 (7.1)
Acute respiratory symptoms* 0.31
Symptoms 12 (9.2) 98 (12.7) 110 (12.2)
No symptoms
119 (90.8)
672 (87.3)

791 (87.89)
Influenza-like illness† 0.39
Symptoms 7 (5.3) 61 (7.9) 68 (7.5)
No symptoms 124 (94.7) 709 (92.1) 833 (92.5)

*Acute respiratory symptoms were rhinorrhea, cough, sore throat, or dyspnea.
†Influenza-like illness was defined as a temperature >38.0°C in conjunction with any of the following: rhinorrhea, cough, sore throat, or dyspnea.

Main Article

1Preliminary findings from this study were presented on June 18, 2007, at the Options for the Control of Influenza Conference VI, Toronto, Ontario, Canada.

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