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SHIC-FUNDED Study Looks At Time By Temp Effectiveness In Supply Entry Rooms

The temperature and time required to inactivate PRRSV and PEDV on contaminated surfaces commonly found in supply entry rooms on swine farms was evaluated in a study conducted by Dr. Gustavo Silva of Iowa State University and funded by SHIC. To reduce the risk of virus introduction through contaminated supplies, recommendations include materials being held at 86°F for at least 24 hours. Another option would be to increase the temperature to at least 104°F, which allows the holding time to be reduced to 12 hours.

Using foggers in supply entry rooms for decontamination of fomites entering sow farms to mitigate risk is a common practice. However, recent research questions the efficacy of this method for pathogen inactivation, especially in complex situations where pathogens may be shielded by organic material or blind spots (Kettelkamp et al., 2019; Leuck et al., 2020).

In this study on time and temperature required for virus inactivation, PRRSV MN184, PRRSV 144 L1C variant, or PEDV were used. Surfaces included diamond plate aluminum and cardboard tested at four temperatures (68°F, 86°F, 104°F and 122°F) with six holding times (15 minutes, 60 minutes, six hours, 12 hours, 24 hours, and 36 hours). Once the surface temperature reached the desired condition, the coupons were held for the designated holding time. Negative controls remained at room temperature for 36 hours and positive controls remained at room temperature for 15 minutes. Three replicates of each treatment were performed and each coupon was inoculated with 2mL of virus or 2mL of media (negative control). Virus titration was performed for each sample after the holding time. Regression models and Weibull curves were built to assess the impact of temperature and time on virus inactivation.

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U.S. Swine Health Improvement Plan | Made by Producers for Producers

Video: U.S. Swine Health Improvement Plan | Made by Producers for Producers

Join Jill Brokaw, a third-generation pig farmer and staff member of the National Pork Board, as she dives into the vital role of the US Swine Health Improvement Plan, also known as US SHIP. The program establishes a national playbook of standards for monitoring African swine fever and classical swine fever.

Why Should Pork Producers Care? If a disease breaks out, officials will establish a control area to help contain the disease. This plan is designed to mitigate risk and demonstrate freedom of disease at the site level. The goal is to support business continuity outside of the control area in case of an outbreak.

How Will the Pork Industry Use US SHIP? US SHIP uses already existing programs to support the standards for biosecurity, traceability and disease surveillance.

Biosecurity: This plan uses your completed Secure Pork Supply plan to demonstrate compliance with the biosecurity program standards and shows your ability to reduce the risk of disease introduction.

Traceability: AgView can be used to demonstrate compliance with the traceability standards and the ability to electronically provide State and Federal agencies the traceability information they need to determine where disease is and isn’t.

Disease Surveillance: The Certified Swine Sampler Collector Program helps expand the number of people certified to take samples. In the event of a large-scale foreign animal disease outbreak, we will need a trained group of sample collectors to help animal health officials find where the disease is present. This is to help you demonstrate freedom of disease and support the permitted movement of animals.

Getting Started with US SHIP:

1. Enroll in U.S. Swine Health Improvement Plan

2. Share 30 days of movement data

3. Have a completed Secure Pork Supply Plan

4. Become U.S. SHIP certified

5. Maintain communication with your state

Takeaway: U.S. Swine Health Improvement Plan helps safeguard animal health. Together, we're creating a sustainable future for pork production in the United States and taking steps to strengthen the business of U.S. pork producers everywhere