Porcine reproductive and respiratory syndrome virus (PRRSv) is one of the most significant airborne viruses impacting the pork industry in the US. Non-thermal plasmas (NTPs) are electrical discharges comprised of reactive radicals and excited species that inactivate viruses and bacteria. Our previous experiments using a packed bed NTP reactor demonstrated effective inactivation of bacteriophage MS2 as a function of applied voltage and power. The present study examined the effectiveness of the same reactor in inactivating aerosolized PRRSv. A PRRSv solution containing ∼105 TCID50/ml of PRRSv VR2332 strain was aerosolized at 3 ml/min by an air-jet nebulizer and introduced into 5 or 12 cfm air flow followed by NTP exposure in the reactor. Twin impingers upstream and downstream of the reactor collected samples of the virus-laden air flow for subsequent TCID50 assay and qPCR analyses. An optical particle sizer measured upstream and downstream aerosol size distributions, giving estimates of aerosol filtration by the reactor. The results showed that PRRSv was inactivated to a similar degree as MS2 at the same conditions, with the maximum 1.3-log inactivation of PRRSv achieved at 20 kV and 12 cfm air flow rate. The results demonstrate the potential of properly optimized NTPs in controlling PRRSv transmission.
Bibliographical noteFunding Information:
This project is funded by the National Pork Board, under award # 16-098. The MS2-related work is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award # 2016-67030-24892.
This project is funded by the National Pork Board , under award # 16-098. The MS2-related work is supported by the National Institute of Food and Agriculture , U.S. Department of Agriculture , under award # 2016-67030-24892. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. The authors thank Minmeng Tang for helping in the experimental setup and Prof. Krista R. Wigginton and Yinyin Ye (Univ. of Michigan) for helping us with the MS2 inactivation test. The authors also thank Prof. John Foster and Selman Mujovic (Univ. of Michigan) for helping in the design and power consumption measurements of the packed bed NTP reactor used in this research.
© 2020 Elsevier B.V.
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