10 key actions to change PRRS control
Here are Dr DeBuse’s suggestions for actions that will radically change PRRS control for the better:
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Investigation ”Investigate new PRRS virus emergence more intensively and communicate findings that will guide the industry forward. We need to look
very, very closely at index cases where novel PRRSv strains are detected and do a thorough, extensive investigation. When a new virus is identified, we don’t need hype; we need good epidemiology and conclusions drawn from clear intense investigations.
Pig well-being ”Challenge our pig well-being and neonatal care teams to rethink what they need in terms of tools, treatments, etc. to improve the situa-
tion for the piglets born during the initial 20 weeks of a new PRRS outbreak.
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Research repetition ”Repeat research on dual-infected pregnant sows originally done by Dr Lager and Dr Mengeling at USDA in Ames, IA. We need
to verify that the status has not gotten significantly worse in 25 years of constantly evolving new and more virulent PRRSv.
Pioneering research ”Use the findings of the pioneering research done by the USDA’s Agricultural Research Service on PRRS resistance/susceptibility in
evaluation of new vaccines and new intervention protocols in the area of early outbreak treatments and interventions against PRRS. This data shows there is a subpopulation of highly susceptible pigs that may need special consideration, which we are ignoring today.
Past research ”Conduct a review of past research looking for therapies or interventions that may fit into the avoidance of dual infection for the future.
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New method ”Stop using the RFLP designation for PRRS viruses – it’s absolutely worthless, an assess- ment shared by the leading virologists and
molecular biologists in the USA. Use of RLFP is being misused to convince producers to use MLV vaccine when they should consider other, more appropriate options. Although producers, veterinarians and the industry as a whole need a new method for naming and identification of new PRRS field strains, we simply can’t wait for that to be perfect to get rid of a useless method such as RFLP.
Additional cautions ”Challenge Swine Health Information Center [SHIC] to evaluate, as EMA did, what addi- tional cautions are needed to reduce the
emergence of new PRRS virus isolates from 2022 to 2032. SHIC is specially funded by producers, and only SHIC can avoid the interference in recommenda- tions caused by vaccine advocates. Implement their recommendations.
Additional control measures ”USDA should also critically evaluate if addi- tional control measures are needed in the use of MLV vaccines in each market, since the USA
now has four PRRS MLVs on the market.
Detection on sequence ”Develop the ability in USA to detect on se- quence, even if whole genome sequence is needed, recombination events that lead to
new virus emergence. 10
Better research “Do better research on products that will reduce dependence on MLV vaccine, specifically antiviral drugs or monoclonal
antibodies or other immune stimulants.”
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