Epidemiology of Influenza A virus in Swiss pig herds: subclinical circulation and associated risk factors. 2026 Steiner, J., Voelkl, B., Mwange, M., Oberholster, L., Licheri, M., Licheri, M.F., Dijkman, R., Kelly, J.N., & Nathues, H. Porcine Health Management. Link to article