PRRS – Swine in Minnesota

Review of MSHMP PRRS Chart 2 ‐ Prevalence.

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.

Key Points:

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.

Is the 2020-21 PRRS a different one?

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.

Key points

MSHMP data shows a slight lower PRRS incidence than in previous years
There has been PRRS outbreaks clustered in time and space in specific regions where the virus has generated important losses
PRRS prevalence has been at an all-time high, contributing to the general perception of a higher burden of PRRS

PRRS 2019-2021 Exponentially Weighted Moving Average by State

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.

This week, the MSHMP team shares the 2019-2021 PRRS incidence by state and how it influenced exponentially weighted moving average (EWMA).

Reminder: What is Exponentially Weighted Moving Average?

Keypoints

We continue to observe different EWMA patterns across states.
Iowa, Minnesota and Nebraska are undergoing an epidemic of larger magnitude and duration when compared to the previous year.
Even though fall and winter continue to be the seasons with overall higher incidence, sporadic cases in warmer months were observed throughout the states.

Litter level agreement of PRRS PCR results in testicles, tails and udder wipes samples

This recent publication by former MSHMP post-doc Dr. Carles Vilalta compares various sample types used to assess PRRS status of piglets at the litter level. The paper is available in the Preventive Veterinary Medicine journal.

PRRS virus dissemination across pig production systems in the United States

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.

This week, we are sharing the summary of a work done at North Carolina Sate University by Dr. Gustavo Machado and his lab on PRRS virus dissemination based on MSHMP data.