Highly divergent neurovirulent vaccine-derived polioviruses of all three serotypes are recurrently detected in Finnish sewage
Roivainen, M and Blomqvist, S and al-Hello, H and Paananen, A and Delpeyroux, F and Kuusi, M and Hovi, T, Eurosurveillance, 15, 19566 (2010), https://doi.org/10.2807/ese.15.19.19566-en