Detection and Isolation of Swine Influenza A Virus in Spiked Oral Fluid and Samples from Individually Housed, Experimentally Infected Pigs: Potential Role of Porcine Oral Fluid in Active Influenza A Virus Surveillance in Swine., Decorte, Inge, Steensels Mieke, Lambrecht Bénédicte, Cay Ann Brigitte, and De Regge Nick , PLoS One, 2015, Volume 10, Issue 10, p.e0139586, (2015)