Department of Biomedicine and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Vet J. 2012 Jul;193(1):135-9. doi: 10.1016/j.tvjl.2011.11.013. Epub 2012 Jan 9.
Outdoor reared pigs were used as indicators for investigating the effect of weather conditions in the seroprevalence of Leptospira. Over the period February to March 2008, sera from 386 sows on 11 farms in southern Sweden were tested for antibodies to the following Leptospira serovars: L. interrogans serovar (sv) Bratislava, L. kirschneri sv Grippotyphosa, L. interrogans sv Icterohaemorrhagiae, L. interrogans sv Pomona, L. borgpetersenii sv Tarassovi and one domestic strain (mouse 2A) related to L. borgpetersenii sv Sejroe and L. borgpetersenii sv Istrica. The highest seroprevalence was to this strain (8.0%) followed by sv Bratislava (3.9%). Six of the 11 farms had sows which were seropositive to at least one of the Leptospira serovars. Data on rainfall and temperature were retrieved for the respective farms. For each millimetre of extra rainfall, there was an increase in the odds ratio (OR) for seropositivity to sv Bratislava of 4.3 (95% CI 1.9-10), and to strain mouse 2A of 2.5 (95% CI 1.0-6.4). There was no association between seropositivity and temperature. This study indicates that different climate conditions within the northern temperate climate zone may be of importance for the presence of Leptospira-seropositivity in mammals.
户外饲养的猪被用作指示物，以调查天气条件对钩端螺旋体血清阳性率的影响。在 2008 年 2 月至 3 月期间，对瑞典南部 11 个农场的 386 头母猪的血清进行了以下钩端螺旋体血清型的抗体检测：波拉利斯血清型（sv）、格里波托菲萨血清型（sv）、伊克托哈马罗哈血清型（sv）、波蒙纳血清型（sv）、塔拉萨奥维血清型（sv）和一种与波拉利斯血清型（sv）、伊斯特里卡血清型（sv）有关的国内菌株（鼠 2A）。最高的血清阳性率是这种菌株（8.0%），其次是 sv 布拉迪斯拉发（3.9%）。在 11 个农场中，有 6 个农场的母猪对至少一种钩端螺旋体血清型呈血清阳性。为各个农场检索了降雨和温度数据。每增加一毫米降雨量，sv 布拉迪斯拉发血清阳性的优势比（OR）就会增加 4.3（95%CI 1.9-10），而对鼠 2A 菌株的 OR 则增加 2.5（95%CI 1.0-6.4）。血清阳性与温度之间没有关联。本研究表明，在北温带气候区内，不同的气候条件可能对哺乳动物中钩端螺旋体血清阳性的存在具有重要意义。
