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Field Performance of Two Methods for Detection of Poliovirus in Wastewater Samples, Mexico 2016–2017

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Abstract

To enhance our ability to monitor poliovirus circulation and certify eradication, we evaluated the performance of the bag-mediated filtration system (BMFS) against the two-phase separation (TPS) method for concentrating wastewater samples for poliovirus detection. Sequential samples were collected at two sites in Mexico; one L was collected by grab and ~ 5 L were collected and filtered in situ with the BMFS. In the laboratory, 500 mL collected by grab were concentrated using TPS and the sample contained in the filter of the BMFS was eluted without secondary concentration. Concentrates were tested for the presence of poliovirus and non-poliovirus enterovirus (NPEV) using Global Poliovirus Laboratory Network standard procedures. Between February 16, 2016, and April 18, 2017, 125 pairs of samples were obtained. Collectors spent an average (± standard deviation) of 4.3 ± 2.2 min collecting the TPS sample versus 73.5 ± 30.5 min collecting and filtering the BMFS sample. Laboratory processing required an estimated 5 h for concentration by TPS and 3.5 h for elution. Sabin 1 poliovirus was detected in 37 [30%] samples with the TPS versus 24 [19%] samples with the BMFS (McNemar’s mid p value = 0.004). Sabin 3 poliovirus was detected in 59 [47%] versus 49 (39%) samples (p = 0.043), and NPEV was detected in 67 [54%] versus 40 [32%] samples (p < 0.001). The BMFS method without secondary concentration did not perform as well as the TPS method for detecting Sabin poliovirus and NPEV. Further studies are needed to guide the selection of cost-effective environmental surveillance methods for the polio endgame.

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Acknowledgements

We are grateful to the local field staff at Hidalgo (Víctor Manuel Bustos Zamora, Gabriela Muños Villegas, Carlos Alberto de la Guardia Ángeles) and Mexico City (José Antonio Herrera Cobos, Jorge Morales López) for their contribution to the collection and initial processing of the environmental samples. We would also like to acknowledge Alexandra L Kossik for supporting the training of field and laboratory staff in the use of the bag-mediated filtration system; Dr. Steven G. F. Wassilak, Dr. Mark A. Pallansch and Dra. Tamara Mancero Buchelli, for their contributions to the study design and planning; Hongmei Liu and Jane Iber for sequencing; and Dr. Angela Coulliette-Salmond, and Jeff Shirai for their support to the coordination of logistics for study implementation.

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The findings and conclusions in this Article are those of the authors and do not necessarily represent the views of the Centers for Disease control and Prevention.

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This study was supported by funding from the Centers for Disease Control and Prevention.

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Correspondence to Concepción F. Estívariz.

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Estívariz, C.F., Pérez-Sánchez, E.E., Bahena, A. et al. Field Performance of Two Methods for Detection of Poliovirus in Wastewater Samples, Mexico 2016–2017. Food Environ Virol 11, 364–373 (2019). https://doi.org/10.1007/s12560-019-09399-9

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