Menangle

1. Menangle Pig Paramyxovirus Infection, Porcine Paramyxovirus Infection

2. Overview • Organism • Economic Impact • Epidemiology • Transmission • Clinical Signs • Diagnosis and Treatment • Prevention and Control • Actions to Take Center for Food Security and Public Health, Iowa State University, 2011

3. The Organism

4. The Organism • Paramyxoviridae • Rubulavirus • Affects swine, humans • Not highly contagious • Spreads slowly throughout the herd • Poor survival in the environment Center for Food Security and Public Health, Iowa State University, 2011

5. Importance

6. Economic Impact • New South Wales, Australia, 1997 • Reduced farrowing rates • Reduced litter number and size • Mummified and stillborn piglets • Pseudopregnancy in sows • Strong immunity develops post-infection • Decreased animal inventory resulted in economic losses Center for Food Security and Public Health, Iowa State University, 2011

7. Epidemiology

8. History • 1997: New South Wales, Australia • 2,600 sow intensive piggery • 4 breeding units • 21 week period • Mummified fetuses and stillborn piglets • Reduced farrowing rates • Reduced number and size of litters Center for Food Security and Public Health, Iowa State University, 2011

9. Transmission

10. Fruit bats (flying foxes) Pteropus poliocephalus P. alecto P. conspicillatus P. scapulatus Native to Australia Seropositive before and during 1997 outbreak Reservoir The grey-headed flying fox (Pteropus poliocephalus) Center for Food Security and Public Health, Iowa State University, 2011

11. Transmission • Bat to pig • Fecal-oral suspected • Pig to pig • Oral-fecal suspected • Human • No known contact with fruit bats • Very close contact with infected pigs Center for Food Security and Public Health, Iowa State University, 2011

12. Animals and Menangle

13. Clinical Signs • Incubation period unknown • Seroconvert in 10 to 14 days • Reproductive • Fetal mummification and stillbirths • Reduced farrowing rate, abortions • Reduced number and size of litters • No clinical signs in postnatal pigs • Other animal species seronegative Center for Food Security and Public Health, Iowa State University, 2011

14. Severe degeneration of brain and spinal cord Arthrogryposis Brachygnathia Domed cranium Histopathology Degeneration, necrosis of nervous tissue Inclusion bodies Nonsuppurative myocarditis Post Mortem Lesions Center for Food Security and Public Health, Iowa State University, 2011

15. Morbidity/ Mortality • Farrowing percentage reduced from 82% to 38% • Number of live piglets per litter declined • No further reproductive failure once disease is endemic • No disease in postnatal pigs Center for Food Security and Public Health, Iowa State University, 2011

16. Differential Diagnosis • Classical swine fever • Porcine reproductive and respiratory syndrome • Porcine parvovirus infection • Aujeszky’s disease (pseudorabies) • Blue eye paramyxovirus (La Piedad Michoacan) • Japanese encephalitis • Leptospirosis • Brucellosis Center for Food Security and Public Health, Iowa State University, 2011

17. Sampling • Before collecting or sending any samples, the proper authorities should be contacted • Samples should only be sent under secure conditions and to authorized laboratories to prevent the spread of the disease Center for Food Security and Public Health, Iowa State University, 2011

18. Diagnosis • Clinical • Increase in mummified, stillborn piglets • Laboratory Tests • Serology - antibody (sows) • Virus neutralization, ELISA • Virus isolation (piglet) • Definitive diagnosis • Brain, lung, myocardial tissue Center for Food Security and Public Health, Iowa State University, 2011

19. Treatment • No treatment • Once infected, no further reproductive failures occur • No vaccine Center for Food Security and Public Health, Iowa State University, 2011

20. Menangle in Humans

21. Public Health Significance • Two human cases • Sudden fever, malaise, chills, drenching sweats, headache, myalgia • Followed by spotty, red, non-pruritic rash • No coughing, vomiting, or diarrhea • Recovered in 10-14 days Center for Food Security and Public Health, Iowa State University, 2011

22. Prevention and Control

23. Recommended Actions IMMEDIATELY notify authorities Federal • Area Veterinarian in Charge (AVIC) http://www.aphis.usda.gov/animal_health/area_offices/ State • State veterinarian http://www.usaha.org/StateAnimalHealthOfficials.pdf Quarantine Center for Food Security and Public Health, Iowa State University, 2011

24. Prevention and Control • Avoid contact between fruit bats and swine • Endemic population • Remove pigs ages 10-16 weeks • Restock with unexposed pigs or pigs known to be immune to the virus • No vaccine Center for Food Security and Public Health, Iowa State University, 2011

25. Prevention and Control • Reduce occupational exposure for swine workers • People conducting necropsies or assisting at births • Wear gloves, goggles, and other personal protective clothing • Wash contaminated skin immediately • Avoid contact with bats Center for Food Security and Public Health, Iowa State University, 2011

26. Additional Resources • APHIS-Center for Emerging Issues • http://www.aphis.usda.gov/animal_health/emergingissues/downloads/menangle.pdf • CSIROnline (Commonwealth Scientific & Industrial Research Organisation) • www.csiro.au • Communicable Diseases Network Australia • www.health.gov.au Center for Food Security and Public Health, Iowa State University, 2011

27. Additional Resources • World Organization for Animal Health (OIE) • www.oie.int • U.S. Department of Agriculture (USDA) • www.aphis.usda.gov • Center for Food Security and Public Health • www.cfsph.iastate.edu • USAHA Foreign Animal Diseases(“The Gray Book”) • www.usaha.org/pubs/fad.pdf Center for Food Security and Public Health, Iowa State University, 2011

28. Acknowledgments Development of this presentationwas funded by grants from the Centers for Disease Control and Prevention, the Iowa Homeland Security and Emergency Management Division, and the Iowa Department of Agriculture and Land Stewardshipto the Center for Food Security and Public Health at Iowa State University. Authors: Glenda Dvorak, DVM, MS, MPH; Radford Davis, DVM, MPH, DACVPM; Anna Rovid Spickler, DVM, PhD Reviewers: Bindy Comito, BA; Katie Spaulding, BS; Kerry Leedom Larson, DVM, MPH, PhD Center for Food Security and Public Health, Iowa State University, 2011