Sartorius Benn, Andersson Yvonne, Velicko Inga, De Jong Birgitta, Löfdahl Margareta, Hedlund Kjell-Olof, Allestam Gorel, Wångsell Claes, Bergstedt Olof, Horal Peter, Ulleryd Peter, Soderstrom Ann
European Programme for Intervention Epidemiology Training (EPIET), Solna, Sweden.
Scand J Infect Dis. 2007;39(4):323-31. doi: 10.1080/00365540601053006.
A large community outbreak of norovirus (NV) gastrointestinal infection occurred in Västra Götaland County, Sweden in August 2004, following attendance at recreational lakes. A frequency age-matched case control study was undertaken of persons who had attended these lakes to identify risk factors. 163 cases and 329 controls were included. Analysis indicates that having water in the mouth while swimming (OR=4.7; 95% CI 1.1-20.2), attendance at the main swimming area at Delsjön Lake (OR=25.5; 95% CI 2.5-263.8), taking water home from a fresh water spring near Delsjön lake (OR=17.3; 95% CI 2.7-110.7) and swimming less than 20 m from shore (OR=13.4; 95% CI 2.0-90.2) were significant risk factors. The probable vehicle was local contamination of the lake water (especially at the main swimming area). The source of contamination could not be determined.
2004年8月，瑞典韦斯特罗斯-哥德堡省在人们前往休闲湖泊游玩后，爆发了大规模诺如病毒（NV）胃肠道感染疫情。针对前往这些湖泊游玩的人群开展了一项频率匹配的病例对照研究，以确定风险因素。研究纳入了163例病例和329名对照。分析表明，游泳时口中含水（比值比[OR]=4.7；95%置信区间[CI]为1.1 - 20.2）、前往德尔湖的主要游泳区域（OR=25.5；95% CI为2.5 - 263.8）、从德尔湖附近的淡水泉取水带回家（OR=17.3；95% CI为2.7 - 110.7）以及在距离岸边不到20米的地方游泳（OR=13.4；95% CI为2.0 - 90.2）是显著的风险因素。可能的传播媒介是湖水的局部污染（尤其是在主要游泳区域）。污染源无法确定。
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