This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.
- Chart 2 depicts the prevalence (e.g. the proportion of breeding herd in each of the PRRS status categories over time).
- Since 2013, the proportion of farms that vaccinate (2vx) and that use field virus (2fvi) has not changed dramatically.
- The cyclical pattern of farms in status 1 observed early in the program is slowly disappearing after 2019.