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Evaluation of an electrostatic particle ionization technology for decreasing airborne pathogens in pigs

机译：静电粒子电离技术减少猪中空气传播病原体的评估

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摘要

Influenza A virus (IAV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine epidemic diarrhea virus (PEDV) and Staphylococcus aureus are important swine pathogens capable of being transmitted via aerosols. The electrostatic particle ionization system (EPI) consists of a conductive line that emits negative ions that charge particles electrically resulting in the settling of airborne particles onto surfaces and potentially decreasing the risk of pathogen dissemination. The objectives of this study were to determine the effect of the EPI system on the quantity and viability of IAV, PRRSV, PEDV and S. aureus in experimentally generated aerosols and in aerosols generated by infected animals. Efficiency at removing airborne particles was evaluated as a function of particle size (ranging from 0.4 to 10 A mu m), distance from the source of ions (1, 2 and 3 m) and relative air humidity (RH 30 vs. 70 %). Aerosols were sampled with the EPI system "off" and "on." Removal efficiency was significantly greater for all pathogens when the EPI line was the closest to the source of aerosols. There was a greater reduction for larger particles ranging between 3.3 and 9 A mu m, which varied by pathogen. Overall airborne pathogen reduction ranged between 0.5 and 1.9 logs. Viable pathogens were detected with the EPI system "on," but there was a trend to reducing the quantity of viable PRRSV and IAV. There was not a significant effect on the pathogens removal efficiency based on the RH conditions tested. In summary, distance to the source of ions, type of pathogen and particle size influenced the removal efficiency of the EPI system. The reduction in infectious agents in the air by the EPI technology could potentially decrease the microbial exposure for pigs and people in confinement livestock facilities.
机译：甲型流感病毒（IAV），猪繁殖与呼吸综合征病毒（PRRSV），猪流行性腹泻病毒（PEDV）和金黄色葡萄球菌是重要的猪病原体，能够通过气溶胶传播。静电粒子电离系统（EPI）由发射负离子的导线组成，该负离子使粒子带电，从而导致空气中的粒子沉降到表面上，并可能降低病原体传播的风险。这项研究的目的是确定EPI系统对实验产生的气溶胶和感染动物产生的气溶胶中IAV，PRRSV，PEDV和金黄色葡萄球菌的数量和活力的影响。评估去除空气中颗粒的效率取决于颗粒大小（0.4至10 Aμm），离离子源的距离（1、2和3 m）和相对空气湿度（RH 30对70％）的函数。使用EPI系统“关闭”和“打开”对气溶胶进行采样。当EPI品系最接近气溶胶来源时，所有病原体的去除效率都明显更高。对于范围在3.3和9 Aμm之间的较大颗粒，减少幅度更大，这些颗粒随病原体的不同而不同。空气中病原体的总体减少量介于0.5和1.9 log之间。 EPI系统“打开”检测到了可行的病原体，但存在减少可行PRRSV和IAV数量的趋势。根据所测试的RH条件，对病原体去除效率没有显着影响。总之，离离子源的距离，病原体的类型和粒径影响了EPI系统的去除效率。通过EPI技术减少空气中的传染性病原体，有可能减少封闭式畜牧设施中的猪和人的微生物暴露量。

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