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Barring the Door to Foreign Diseases
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adult antibiotics antibodies aquarium areas avian avian influenza bacteria bacterial bacterium beef birth blood body breeders breeding brucellosis cage calcium calf calves canine canine distemper carrier catfish cattle cause cells chickens clean clinical signs coccidiosis colostrum common cough cows dairy death defects demodicosis develop diagnosis diarrhea diet disease disinfected dogs and cats drugs duce ease eggs farm feces fected fection feed feline fever fish flock fowl game birds genetic growth herd immunity important infection intestinal kennel cough Kevin Shields kids lambs lameness legs leptospirosis lesions litter liver loss lungs mals mastitis ment milk mites nutritional occur organisms outbreaks parasites pasture percent pet birds pigs pneumonia poultry prevent problems produce protein pseudorabies require respiratory result Scott Adams screwworm severe skin species spread swine ticks tion tive treated treatment tumors ture types usually vaccines veterinarian viral virus viruses vitamin weeks of age worms