Disease Notes

Disease Notes - DiseaseNotes 17:40 1....

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Disease Notes 17:40 1. Guides to swine disease notes a. Know classification/ type of disease b. Know general symptoms c. Know causing agent- bacteria, virus, parasite 2. Eradicated U.S. swine disease (10 on the badness scale) a. Hog cholera b. Swine fever i. Hemorrhagic  disease. Causes lots of bleeding internally ii. Virus iii. Very very severe iv. Same as Hog Cholera v. Usually kills the pigs c. Hoof and mouth i. A virus ii. Family: Picornaviridae; genus: apthovirus (aptha, greek: means vesicles in  the mouth) iii. RNA virus; 7 serotypes (strains) iv. Can infect pigs, cattle, sheep and goats v. Aerosol is highly contagious (breathing) vi. Pig will form a blister on the snout and vesicles on the feet. Track the virus  on their feet and wherever they breathe vii. More of a general virus that hurts the productivity of the pig. Doesn’t  usually kill the animal. Bad because it is so contagious
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3. Diseases that are regulated by the U.S. government (want to get rid of these.  Won’t usually wipe out your farm if you have it though) (8-9 on a bad scale) a. Pseudorabies i. Also known as Aujeszky’s disease ii. Viral; herpesviridae iii. While pigs are the only “natural” host, it infects all farm animals and vermin iv. All stages of pigs can be infected v. Transmitted by aerosols, fluids, and semen vi. 2-4 day incubation period  vii. Nervous symptoms among younger pigs (ataxia) and respiratory and  reproductive symptoms among older pigs (G-F and sows) viii.Mortality can be 100% among piglets. Also hard on nursery pigs ix. Farrowing rate is reduced due to abortions and many stillbirths are  observed x. Pigs look “unthrifty” as they get it. Could die, or might look unthrifty for the  rest of their life xi. 10-15% mortality for bigger pigs b. Brucellosis i. Bacteria- Brucella suis ii. Infects pigs and humans- a different organism infects cattle (Brucella  abortus) iii. Nearly eradicated in the USA (Texas still infected) iv. You have to be validated as free from these by state agencies (not  pseudorabies) v. Feral pigs are major carriers of these and other diseases 4. Major classes of production diseases a. Respiratory
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i. PRRS (9) 1. Porcine respiratory and reproductive syndrome 2. Virus 3. In 1997, 68.5% of USA farms were seropositive 4. Farrowing rate decline by 50% 5. Stillbirths and pre-weaning mortality and growing pig mortality  increases by 300% 6. Modified live vaccine offers poor protection 7. No effective treatment 8. Widespread problem; not solved by SEW (segregated early weaned) or  any measure other than “all-in-all-out and wait” or depopulate 9. Reddening around the ears sometimes. Also splotches of red around 
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This note was uploaded on 12/27/2010 for the course ASCI 222 taught by Professor Petty during the Fall '10 term at Cal Poly.

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Disease Notes - DiseaseNotes 17:40 1....

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