Wild poliovirus type 3 (WPV3)-shedding event following detection in environmental surveillance of poliovirus essential facilities, the Netherlands, November 2022 to January 2023.

On 21 November 2022, a wild poliovirus type 3 (WPV3) was isolated from an environmental surveillance sample of poliovirus essential facilities in the Netherlands. All 51 employees with access to this strain were screened for ongoing or recent poliovirus infection. One employee shedding WPV3 was identified on 8 December and placed in isolation; monitoring and contact tracing were initiated.

Cytochrome oxidase c subunit 1 polymorphisms show significant differences in distribution between a laboratory maintained population and a field isolate of Cooperia oncophora.

A 474 bp fragment of the mitochondrial cytochrome oxidase c subunit 1 (cox1) of Cooperia oncophora was cloned and sequenced. The overall nucleotide diversity of the cox1 fragment varied from 0.5 to 2.