REVIEW published: 22 February 2019 doi: 10.3389/fvets.2019.00034 Frontiers in Veterinary Science | www.frontiersin.org 1 February 2019 | Volume 6 | Article 34 Edited by: Massimo Amadori, Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna Bruno Ubertini (IZSLER), Italy Reviewed by: Dongbo Sun, Heilongjiang Bayi Agricultural University, China Daniel Marc, INRA Centre Val de Loire, France *Correspondence: Surapong Koonpaew