Science Page: Bob Morrison’s legacy

Bob_MorrisonThis is our Friday rubric: every week a new Science Page from the Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week, the Science Page honors Dr. Robert Morrison, the founder and leader of the Swine Health Monitoring Project.

Bob’s unique talent for creating relationships that advanced the swine industry culminated in the creation of the Swine Health Monitoring Project (SHMP), one of the initiatives that Bob carried with pride. […] As it evolved, the SHMP changed names several times but many in the industry simply refer to it as “Bob’s project”. For that reason, and to give the just recognition he deserves, we have decided to renam the project to “Dr. Bob Morrison’s SHMP” (MSHMP).

Science page: Evaluation of positive pressure filtration to reduce aerosol transmission of PRRSV during an experimental challenge of farm access points

This is our Friday rubric: every week a new Science Page from the Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Key points from this week edition:

  • Dilute vaccine aerosolization combined with novel environmental sampling techniques allowed for testing of PRRSV aerosol entry into Positive Pressure Filtration (PPF) farm access points.
  • Under the experimental conditions of this study, positive pressure air speeds >1.85m/s resulted in no aerosol transmission.
  • Ensuring adequate positive pressure air speed through steps taken to increase access point pressure can further reduce the risk of aerosol PRRSV transmission on PPF farms.

The full report on positive pressure filtration and PRRSV transmission via aerosols is available.

Science page: M. hyopneumoniae outbreaks: what you need to know to aid in your investigation

This is our Friday rubric: every week a new Science Page from the Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Key points from this week edition:

Molecular characterization tools such as p146 sequencing for Mycoplasma hyopneumoniae (M. hyopneumoniae) can provide insight towards investigating elimination failures or new introductions within swine herds.

Science page: Measuring production losses from endemic PRRS in US farms

This is our new Friday rubric: every week a new Science Page from the Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Key points from this week edition

We analyzed performance records from 16 sow farms that were vaccinated with PRRS virus and experienced a PRRS virus infection.

Production dropped until the 6th week post-outbreak with a second decline between the 11th and 18th week post-outbreak.

We calculated an average decrease of 1.92 weaned pigs per sow (min=0.51, max=3.72) per year attributable to changes in farrow rate and prewean mortality.

The full report on production losses from endemic PRRS farms in the US is available.

 

 

Science page: Mycoplasma hyorhinis and conjunctivitis in pigs

This is our new Friday rubric: every week a new Science Page from the Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Key points from this week’s edition:

Conjunctivitis in pigs has been associated with various infectious agents, among them, Mycoplasma hyorhinis.
We investigated various outbreaks of conjunctivitis in pigs without apparent non-infectious predisposing factors.
Eye swabs and tissues from animals with conjunctivitis and non-affected contact pen mates were positive for M.hyorhinis by PCR and culture.
The exact role of Mycoplasmas in the development of conjunctivitis in pigs is still unclear.
The full report with pictures of the lesions is now available.