Zoonotic disease pdf
Dr. Dina A. B. Awad discusses milk-borne pathogens, including various zoonotic diseases that can infect humans through contaminated milk and dairy products. The document outlines the causes, symptoms, transmission modes, and control measures for several diseases such as bovine tuberculosis, brucellosis, Q-fever, and leptospirosis. Effective control strategies include adequate heat treatment, eradication of infected animals, and prevention of post-pasteurization contamination.
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Zoonotic disease pdf
- 1. Dr. Dina A.B. Awad Lecturer food hygiene and control , faculty of veterinary medicine Benha university, Egypt
- 2. Milk borne pathogens Arepathogenic microorganisms which cause diseases for consumers. Zoonotic disease (Animal origin) Epidemic disease (Human origin) Diseased dairy animal Infective Agent Drinking contaminated milk human Milk producers, distributors Infective Agent Drinking contaminated milk human
- 3. Zoonotic disease (Animalorigin) Rabbis Listeriosis leptospirosis Lumby jaw Cow pox Q-fever Foot and mouth disease Brucellosis Bovine tuberculosis Anthrax Symptoms cause Mode of transmission enumerate Yersinosis Campylobacterosis
- 4. Bovine tuberculosis (T.B) causeMycobacterium tuberculosis var bovis - Acid fast bacilli - Rod shape in pairs - Motile - Non capsulated non spore - Aerobic - The thermal death point (60C/15-20min) - High susceptible to sunlight and UV radiation Symptoms - Fever - Coughing with bloody sputum - Respiratory disorders - Emaciation &loss of appettite - Death
- 5. Mode of transmission Consumption ofraw milk Or milk products (Vehicle) Generalized T.B or tuberculous mastitis Direct source of milk contamination Indirect source of milk contamination feces sputum urine Uterine discharge
- 6. Control (T.B) Milk Diseased animal - Adequateheat treatment (pasteurization) - Discard milk from infected animal - Eradication diseased one . - Newly purchased quarantine - (tuberculin test) (S.C or ID) Page( 93) (10%) Manotoux test or rontogenographic screen
- 7. Brucellosis (Bang disease,storm abortion, contagious abortion) cause Brucella abortus bovine (contagious abortion or Bangs disease) Undulant fever Brucella melitensis sheep& goat Malta fever Brucella suis pork & cattle brucellosis - Gram negative coccobacilli - Micro-aerophilic need O2 and 10% CO2 - Non Motile - Non spore - Able to grow intracellular, localized in lymph node, liver, spleen, bone marrow - The thermal death point (60/10min) - Survive natural acidity??????????????????? - Persist in dust and soil for 2-3 month. - Rare to cause clinical mastitis - All spp can infect man and excrete in milk. It is occupational disease Spp. Animal. Man.
- 8. (MOT)Sources of milk contamination Uterinedischarge Aborted fetus (MO localized in udder) Placenta (contaminate dust) Dust borne infection Sources of transmission to human 1- direct contact with infected animals or their discharges. 2- inhalation of dust contaminated with brucella. 3-ingestion of infected milk or unpasteurized dairy product.
- 9. Symptoms - Undulant Fever(Malta fever) - Abortion in pregnant animals - Orachitis in male - Emaciation &loss of appetite - Localized pain in back, abdomen, neck and joint. Control Milk Diseased animal - Adequate heat treatment - Avoid post pasteurization contamination - ABRT (bulk milk from 10 animals) - Eradication diseased one . - Serum agglutination test - Vaccination programs
- 10. ABRT Positive negative Positivenegative
- 11. Queery fever (Q- fever) cause Coxiella burnettii----obligate itracellular Gram negative bacteria. -Caused by rod shape coccoid cell coxiella brunetti (intra cellular) -Resistant heat ,pasteurization and freezing. -Resistant chemical agents as formalin 0.5% and phenol -Present in large amount in placental tissues. -Transmitted by ticks( tick borne disease) (vacoules)
- 12. Mode of transmission (Q-fever) Infectedcattle continue to secrete Coxiella brunetti in their milk for 200 days. - Inhalation of contaminated dust - Consumption of raw milk. Sources of transmission
- 13. Symptoms (Q-fever) Animal human Generalweakness Influenza like symptoms, CNS Control Milk Diseased animal - Adequate heat treatment - Eradication diseased one .
- 14. Actinomycosis (lumpy jaw) -Caused by actinomyces bovis - Commonly found around mouth - Need wounds to reach blood----then milk Symptoms (lumpy jaw) Animal human Abscess with capsulation in jaw, tongue Diarrhea , abscess in the intestinal Control Milk Diseased animal - Adequate heat treatment - Eradication infected milk.
- 15. leptospirosis (weils diseaseor mud fever, swamp fever) L. interrogans -Heat labile/acidity -Persist 4C/2 month -Survive pasteurization -Destroyed boiling Consume raw milk Swine herd disease Headache Musclepain Bleeding lung Meningitis Jaundice Renal failure
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- 17. Yersinosis Could be isolatedfrom drinking water, milk, ice cream
- 19. Thank you forattention Presented by : Dr. Dina A. B. Awad Lecturer of food hygiene department Faculty of veterinary medicine Benha university , Egypt Dr.Dina A.B. Awad 19