Enlarge / Transmission electron micrograph of poliovirus type 1. (credit: Getty | BSIP) An eradicated form of wild polio surfaced in routine wastewater monitoring in the Netherlands last year, offering a cautionary tale on the importance of monitoring for the tenacious virus, researchers report this week in the journal Eurosurveilance. The sewage sample came up positive for infectious poliovirus in mid-November and genome sequencing revealed a strain of wild poliovirus type 3, which was declared globally eradicated in 2019.