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. 
Continue reading “Review of MSHMP PRRS Chart 2 ‐ Prevalence.”

Senecavirus A continues to be present in the United States swine herd

This week, Dr. Guilherme Preis, graduate student at the University of Minnesota with Drs. Corzo and Vannucci is sharing an update on the prevalence of Senecavirus A in the United States.

Key Points

  • Senecavirus A continues to present in the US at low levels. 
  • Sow herds are more likely to test positive than growing pig herds. 
  • SVA positive herds tend to have a large number of positive samples. 
Continue reading “Senecavirus A continues to be present in the United States swine herd”

Detection of PRRSV RFLP type 1-7-4 over time

This week, Dr. Mariana Kikuti from the MSHMP team shares information about the PRRS RFLP type 1-7-4 prevalence in the MSHMP data.

Key Points

  • PRRSV RFLP type 1-7-4 was first identified in our MSHMP dataset in 2003.
  • An increasing trend up to 2014 has been observed and is now on a decreasing trend.
Continue reading “Detection of PRRSV RFLP type 1-7-4 over time”

MSHMP PRRS Prevalence Chart Description

Today, the MSHMP team is explaining the interpretation of Chart 2 of their weekly report. If you missed Chart 1 last week, you may find it here.

Key points

  • The prevalence chart (Chart 2) describes the percentage of herds that are classified in a given status through time.
  • It allows eyeballing general trends although the growing nature of the project does not allow year to year comparisons without proper adjustment.
  • For PRRSv, there is a steady increase in the percentage of herds in status 1 in recent years. PRRSv
Continue reading “MSHMP PRRS Prevalence Chart Description”

Effect of strain-specific maternally-derived antibodies on influenza A virus infection dynamics in nursery pigs

A new scientific article from the Torremorell lab, about the influence of maternal antibodies on influenza dynamics was published in PLoS ONE.

The study followed 10 cohorts of nursery piglets form a single influenza-positive sow farm and compared influenza dynamics based on the vaccination status of the dam.

Continue reading “Effect of strain-specific maternally-derived antibodies on influenza A virus infection dynamics in nursery pigs”