OPP concerned sheep breeders society




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(See more info on our ‘News’ and ‘Links’ pages.)

Introductory Info:

UPDATED  OPP:  Unlocking the Mystery (slide show)  (Holly Neaton, DVM, 2017) (1.8 MB)

NEW  Disease Awareness:  Don’t Buy Trouble! (slide show) (Cindy Wolf, DVM, 2017) (2.6 MB)

Health Challenges for the Sheep Industry (Holly Neaton, DVM, Polypay Newsletter, 2016) (41 KB)

Economic Impact of OPP (Tom & Marilyn Schwebach, 2014 Letter to Pipestone Veterinary News) (94 KB)

OPP Eradication: Why Have We Waited So Long? (Clark BreDahl, The Shepherd magazine, 2012) (254 KB)

USDA-APHIS 2003 OPP Info Sheet (Results from NAHMS 2001 Sheep Survey) (32 KB)

One Farmer's View (Importance of OPP, Greg Pauley) (1.2 MB)

Minnesota’s Eradication Trial:

UPDATED  Eradication Trial Update:  No more orphaning! (Lewman; Neaton, DVM, 2017) (476 KB)

UPDATED  OPP Eradication Trial (slide show) (Lewman, Neaton DVM, 2017 ) (7.4 MB)

NEW  OPP Eradication Trial Year 3 Report (January 2017) (Lewman; Neaton, DVM, 2017) (436 KB)

NEW  OPP Eradication Trial Protocol: January 2017 (Lewman; Neaton, DVM, 2017) (116 KB

Jan 2016 proposal to ASI: National OPP Program (Neaton, DVM; Lewman, The Shepherd, 2016) (174 KB)

OPP/CAE Pilot Program, Minnesota (Test Validation Program for Flocks/Herds in Minnesota, 2013) (148 KB)


cELISA Chlamydia Vaccine Cross-Reactivity Study (Devi Patnayak, BVSc, PhD, The Shepherd, 2015) (729 KB)

OPPV Transmission via Aerosol vs. Oral (Dr Lynn Herrmann-Hoesing et al, 2012 paper) (233 KB)

USDA-APHIS 2015 Info Sheet: Disease Awareness (Results from NAHMS 2011 Sheep Survey) (420 KB)

USDA-APHIS 2015 Info Sheet: Health, Biosecurity (Results from NAHMS 2011 Sheep Survey) (801 KB)

Testing and Control of OPP (Cindy Wolf, DVM, from 2000 MVMA Proceedings) (66 KB)

Horizontal Transmission/Productivity Study (1995 paper reviewed by Bob Leder, DVM) (66 KB)

OPP Controversy (Norm Gates, DVM; Marie S Bulgin, DVM; Bob Leder, DVM) (1.9 MB)

Genetics and OPP:

NOTE: While some may opt to employ the new DNA test in their OPP control efforts, at this time the OPP Society  does not advocate genetic selection as a route to eradication.  In summary, ALL breeds are susceptible to infection with the OPP virus, so ALL shepherds need to be aware of this risk and the related need for biosecurity.

OPP Variant Infects all Genotypes (Dr Michael Clawson et al, 2015 paper from USMARC) (1.7 MB)

Incidence of Infection in 39-month-old ewes,  TMEM154 (Dr Kreg Leymaster et al, 2015) (727 KB)

10th World Congress/Genetics-TMEM154 (Dr Mike Heaton et al, 2014 proceedings) (810 KB)

Genetic Testing for TMEM154 . . . (Dr Mike Heaton et al, 2013 paper includes breeds chart) (1.4 MB)

Integrating Genomics, Testing, and Management Strategies to Control OPP (slide show)

                   (Dr Kreg Leymaster, ASI Convention, January 2013) (8.1 MB)

TMEM154 GeneSeek Submission Form (see our “News” page for more on this OPP susceptibility test) (59 KB)

Genetic Susceptibility (Drs Mike Heaton & Kreg Leymaster, USMARC, 2012 article for OPP Society) (639 KB)

TMEM154 Susceptibility Gene (Dr Mike Heaton et al, 2012 paper from which above article prepared) (532 KB)

Genome-Wide Study of Breeds (2012 paper, International Sheep Genomics Consortium) (946 KB)

Genetic Control of OPP (Dr Lynn Herrmann-Hoesing, USDA-ARS, 2008 article for OPP Society) (78 KB)

Future Tool to Fight OPP? (Dr Stephen White, USDA-ARS, NIAA newsletter 2008, see page 4) (254 KB)

Glossary of Genetic Terms  (Link to excellent talking glossary:  from the National Institutes of Health)

Genetics 101 (Link to fun, easily followed cartoon in 4 parts:  from “23andMe”)


Member Directory (print friendly 8-page format) (356 KB)

Info/Display Items (master copies for reproduction, reduce/enlarge if needed):

3-Fold Brochure (Color, 8-1/2 x 11 paper, print both sides, fold) (283 KB)

Promo Cards (Color, 8-1/2 x 11 card stock, 4 cards/sheet, print both sides, separate/cut) (2.2 MB)

Small Poster (Color, 8-1/2 x 11 card stock) (2.2 MB)

“In my mind, living with a chronic disease (OPP) is like living with a time bomb. One year of bad luck—drought, flooding, moldy hay,  enforced confinement, fill in the blanks—you will start losing good middle aged ewes from what appears to be bacterial pneumonia, or they won't be able to raise their lambs or they can't bounce back after weaning, etc.”