Epidemiology of Foreign and Emerging Animal Diseases Floron C. Faries, Jr., DVM, MS Professor and Extension Program Leader for Veterinary Medicine Department.

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Presentation transcript:

Epidemiology of Foreign and Emerging Animal Diseases Floron C. Faries, Jr., DVM, MS Professor and Extension Program Leader for Veterinary Medicine Department of Large Animal Clinical Sciences Texas Cooperative Extension Texas A&M University System

I. Sources A.Carrier/Reservoir Animals 1. Aerosol Droplets 8. Milk 2. Nasal Fluid 9. Fetal Fluid 3. Ocular Fluid 10. In Utero 4. Saliva 11. Genital Fluid 5. Skin12. Blood 6. Manure 13. Carcass 7. Urine

B. Vectors 1. Ticks 2. Flies 3. Mosquitoes 4. Scavengers 5. People

C. Vehicles 1. Instruments a. Needle b. Ear tagger c. Tattooer d. Dehorner e. Nose tong f. Knife 2. Utensils a. Bucket b. Trough c. Boots d. Clothing

D. Environment 1. Soil 2. Water 3. Food 4. Air

II. Exposures A. Susceptible Animals 1. Mouth 6. Vagina 2. Nose 7. Prepuce 3. Eyes 8. Transplacental 4. Skin 9. Venereal 5. Teats10. Blood

III. Incubation Period A. Long/Short B. Exposure to Symptoms C. Exposure to Positive Tests D. During Incubation Period 1. No Symptoms 2. Negative Tests

E. After Incubation Period 1. Symptoms 2. Positive Tests

IV.Latent Infections (Recrudescent Infections) A. Extended Incubation Period 1. No Symptoms 2. Negative Tests B. After Recrudescence 1. Symptoms 2. Positive Tests

C. Injury 1. Blackleg 2. Malignant Edema 3. Black Disease 4. Black-Neck Disease D. Diet Change/Overload 1. Enterotoxemia

E. Flukes 1. Redwater F. Stress 1. IBR/PI 3 /BVD/BRSV 2. Pasteurella/Haemophilus G. Pregnancy in Heifers 1. Brucellosis

V. Non-Latent Infections A. Normal Incubation Period 1. Lepto 2. Vibrio 3. IBR/PI 3 /BVD/BRSV 4. Pasteurella/Haemophilus 5. Brucellosis in Cows

VI. Stress Factors A. Nutrition B. Weather C. Pregnancy D. Calving E. Working F. Weaning G. Shipping H. Breeding I. Walking

VII. High Risk Herds A. Identify Sources B. Separate Carrier/Reservoir Animals (Shedders) C. Reduce Commingling

D. Vaccinate Susceptible Animals 1. Not 100% Protection a. No response b. Improper procedures c. Mishandled vaccine d. Expired vaccine. e. Stored opened vaccines f. Poor quality vaccine g. Primary dose only

2. Long/Short Protection 3. Vaccinate before exposure 4. Does not prevent recrudescence in latent infections

E. Biosecurity Measures 1. Raise replacements 2. Purchase entries from clean herds 3. Test purchased entries 4. Vaccinate purchased entries 5. Isolate purchased entries 6. Restrict visitor and vehicle entries 7. Construct buffer zone fencing