An outbreak of legionnaire’s disease among visitors to a fair in Belgium, 1999 De Schrijver, K and van Bouwel, E and Mortelmans, L and van Rossom, P and De Beukelaer, T and Vael, C and Dirven, K and Goossens, H and Leven, M and Ronveaux, O, Eurosurveillance, 5, 7 (2000), https://doi.org/10.2807/esm.05.11.00007-en