PMWS vaccines offer outstanding protection

摘要

PMWS has been with us in Britain since 1999. The initial per-acute disease, causing high mortality in weaners and growers of 30 percent has subsided to the chronic form, which we see today, where mortality associated with the disease is reported to range from 0-9 percent, but has moved into older pigs in the late grower or finisher stages (see Graph 1). The disease spread across the United Kingdom and the rest of Europe finally reaching Denmark in 2002. Although initial reports of the disease came from Canada in the 1990s, it appeared to die down and it is only since 2004 it has become a severe problem in both the United States and Canada.