Impact of Age, Season, and Flowing vs. Stagnant Water Habitat on Avian Influenza Prevalence in Mute Swan (Cygnus olor) in Belgium., Lambrecht, Bénédicte, Marché Sylvie, Houdart P, van den Berg Thierry, and Vangeluwe D , Avian Dis, 2016 May, Volume 60, Issue 1 Suppl, p.322-8, (2016)