Are pathogenic microorganisms which cause diseases for consumers Bovine tuberculosis (T.B) Brucellosis (Bang disease, storm abortion, contagious abortion) Queery fever ( Q- fever) Actinomycosis (lumpy jaw) leptospirosis (weils disease or mud fever, swamp fever) Campylobacteriosis Yersinosis

1. Dr. Dina A. B. Awad
Lecturer food hygiene and control , faculty of veterinary medicine
Benha university, Egypt

2. Milk borne pathogens
Are pathogenic 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 (Animal origin)
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)
cause Mycobacterium 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 of raw 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
- Adequate heat 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
Uterine discharge
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 Positive negative

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)
Infected cattle 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
General weakness 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 disease or 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

16. Campylobacteriosis
Ingestion of fecal
contamined milk

17. Yersinosis
Could be isolated from drinking water, milk, ice cream

19. Thank you for attention
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