Estimation of hepatitis E virus transmission among pigs due to contact-exposure Martijn Bouwknegt, Klaas Frankena, Saskia A. Rutjes, Gerard J. Wellenberg, Ana Maria de Roda Husman, Wim H.M. van der Poel and Mart C.M. de JongVet. Res., 39 5 (2008) 40 DOI: https://doi.org/10.1051/vetres:2008017