Imported fresh sugar peas as suspected source of an outbreak of Shigella sonnei in Denmark, April – May 2009 Muller, L and Jensen, T and Petersen, R F and Mølbak, K and Ethelberg, S, Eurosurveillance, 14, 19241 (2009), https://doi.org/10.2807/ese.14.24.19241-en