Poster by Pham Thanh Long, Nguyen Tien Thang, Hung Nguyen-Viet, Bui Nghia Vuong, Can Xuan Minh, Åke Lundkvist and Johanna Lindahl presented at a regional symposium on research into smallholder pig production, health and pork safety, Hanoi, Vietnam, 27–29 March 2019.