Gast R K, Mitchell B W, Holt P S
USDA, ARS, Southeast Poultry Research Laboratory, Athens, Georgia 30605, USA.
Poult Sci. 1999 Jan;78(1):57-61. doi: 10.1093/ps/78.1.57.
Electrostatic space chargers were used to impart a negative charge to airborne dust particles and thereby cause them to be attracted to grounded surfaces. To determine whether negative air ionization could affect the airborne transmission of Salmonella enteritidis, chicks were housed in four controlled-environment isolation cabinets in which airflow was directed across an unoccupied central area from one ("upstream") group of birds to another ("downstream") group. Negative air ionizers were installed in two of these cabinets. In three replicate trials, groups of chicks were placed in the upstream ends of the transmission cabinets and orally inoculated with S. enteritidis at 1 wk of age. On the following day, 1-d-old chicks were placed in the downstream ends of the cabinets. When chicks were sampled at 3 and 8 d postinoculation, S. enteritidis was found on the surface of 89.6% of the downstream chicks from cabinets without negative air ionizers, but on only 39.6% of the downstream chicks in the presence of the ionizers. Similarly, S. enteritidis was recovered from the ceca of 53.1% of sampled downstream chicks in cabinets without ionizers, but from only 1.0% of the ceca of chicks in cabinets in which ionizers were installed. The presence of the ionizers was also associated with reduced levels of circulating airborne dust particles. Reducing airborne dust levels may thus offer an opportunity to limit the spread of S. enteritidis infections throughout poultry flocks.
静电空间充电器用于给空气中的尘埃颗粒赋予负电荷，从而使它们被吸引到接地表面。为了确定空气负离子化是否会影响肠炎沙门氏菌的空气传播，将雏鸡饲养在四个可控环境隔离柜中，气流从一组（“上游”）鸡群穿过未占用的中心区域导向另一组（“下游”）鸡群。在其中两个柜子中安装了空气负离子发生器。在三次重复试验中，将雏鸡组放置在传输柜的上游端，并在1周龄时口服接种肠炎沙门氏菌。第二天，将1日龄雏鸡放置在柜子的下游端。当在接种后3天和8天对雏鸡进行采样时，在没有空气负离子发生器的柜子中，89.6%的下游雏鸡表面发现了肠炎沙门氏菌，但在有负离子发生器的情况下，只有39.6%的下游雏鸡表面发现了该菌。同样，在没有离子发生器的柜子中，53.1%的采样下游雏鸡盲肠中检出了肠炎沙门氏菌，但在安装了离子发生器的柜子中，只有1.0%的雏鸡盲肠中检出了该菌。离子发生器的存在还与空气中循环尘埃颗粒水平的降低有关。因此，降低空气中的尘埃水平可能为限制肠炎沙门氏菌在整个家禽群中的传播提供机会。
