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Enteroviruses are a public health threat due to the high incidence of infections and potential for serious illness or death. Some laboratories in high-income countries detect enteroviruses in water by integrating cell culture and PCR (ICC/PCR). This combined method carries a high financial burden, due in part to specialized cell culture equipment. Therefore, we expanded upon a pilot study to reduce the cost by using common laboratory polypropylene tubes to create a cell culture in suspension. We optimized the protocol by determining minimal incubation periods post-infection as a function of the initial virus concentration. Cells in suspension and traditional monolayers were inoculated with poliovirus and incubated in 8-hour intervals up to 48 hours prior to extraction. Quantitative PCR (qPCR) was used to detect viral nucleic acid targets. Treated and raw water samples were seeded with virus and the suspension ICC/qPCR protocol used to ascertain whether the protocol performed similar to directly seeding cells. No variation in virus detection occurred using the suspension ICC/qPCR or monolayer ICC/qPCR (p = 0.95). In surface water samples, viral nucleic acid was successfully detected, with no significant increase after 32 h (p &gt; 0.05). Suspension ICC/qPCR is as effective as monolayer ICC/qPCR in detecting enteroviruses in surface waters. Materials used in the suspension ICC/qPCR have a lower monetary cost than traditional cell culture materials without loss of sensitivity. More accessible testing of waters for enterovirus contamination through cost reduction has the potential to reduce human exposure and disease.

Optimizing a Suspension Culture Method with a Decreased Cost to Detect Enteroviruses in Water to Increase Surveillance Access