Health and Health Care Behaviour Research Group, School of Public Health, University of Hong Kong, Hong Kong.
Epidemics. 2009 Dec;1(4):207-12. doi: 10.1016/j.epidem.2009.09.002. Epub 2009 Oct 3.
Live poultry in wet markets and backyard husbandry comprise potentially major exposure sources for human cases of H5N1 avian influenza. In China the magnitude of risk from this exposure is unknown. We estimated exposure based on self-reported behavior.
In January-March 2006, 1550 face-to-face interviews derived from stratified cluster and randomized within-household sampling provided data on live poultry exposure in Guangzhou, China based on self-reported buying and touching patterns. Standardized exposures were calculated and after adjustment extrapolated to the urban population.
The results, adjusted for gender, showed that 1,248/1,550 (80%, 95% Confidence Limits 78-82%) respondents reported an average of 20.5 live chicken purchases/household annually. Of those buying poultry 33% touched poultry before buying while 20% of households raised live poultry. Total exposures from wet market and backyard husbandry in Guangzhou greatly exceed those of adjacent Hong Kong (15,280,000 e/year vs. 1,110,900 e/year). Backyard exposure frequency likely exceeds that from live poultry retail, but purchases were more prevalent and hence comprise a significant risk source.
The Guangzhou population faces risks from the high prevalence of exposures during purchase and poultry rearing. Better management for raising and selling poultry in Guangzhou is needed.
活禽在湿货市场和后院养殖是人类感染 H5N1 禽流感的潜在主要暴露源。在中国，这种暴露的风险程度尚不清楚。我们根据自我报告的行为来估计暴露程度。
2006 年 1 月至 3 月，通过分层聚类和随机家庭内抽样，对 1550 名面对面访谈进行了调查，根据自我报告的购买和接触模式，获取了广州活禽暴露的数据。计算了标准化的暴露量，并进行了调整后外推到城市人口。
按性别调整后的结果显示，1550 名受访者中有 1248 人（80%，95%置信区间为 78-82%）报告平均每年每户购买 20.5 只活鸡。在购买家禽的人群中，33%的人在购买前接触过家禽，而 20%的家庭养殖活禽。广州湿货市场和后院养殖的总暴露量远远超过毗邻的香港（1528 万只/年比 111.1 万只/年）。后院的暴露频率可能超过活禽零售，但购买更为普遍，因此是一个重要的风险源。
广州人口在购买和养殖家禽时面临着高暴露率的风险。需要更好地管理广州的家禽养殖和销售。
