parasitic diseases of slaughtered food animals
"last update: 13 Oct 2024"
- I- Parasites directly transmissible to man
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1. Beef measle |
2. Pork measle |
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Cause |
Cysticercus bovis |
Cysticercus cellulosa |
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F.H |
Man |
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I.M.H |
Cattle and Buffalo |
Mainly in Pig and Man |
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Judgement |
More than one cyst living or dead in an area of the size of a hand palm in different cuts of carcass is considered heavy infestation and requires T. Otherwise considered light and conditionally passed after freezing, boiling steaming, or pickling. |
Even one cyst living or dead detected in any part of the carcass or organ makes total condemnation (T).
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3- Trichinosis (the smallest nematode)
Cause: Trichinella spiralis larvae
Host: Pig, wild boar, rat, mice, dog, man and cat. Ruminants, horses, and birds show natural immunity while camels can infest experimentally.
Resistance: Viable in decomposed meat for 2 year
Judgement: Even one cyst live or dead requires total condemnation
Control measures
- Pig flesh is trichinella-free
- Pork should be ground in a separate grinder
- Control rodents
- Proper cooking (at least 30 min at 100°C) of swill fed to pigs
Man
- Cooking: Meat color changes from pink to grey and easily separates muscle fibers.
- Freezing (-15 ° C for 20 days thickness less than 6 inches)
Irradiation: in countries allowing irradiation
4- Sarcosporidia
• F.H: Ingestion of cysts (bradyzoites)
• I.M.H: Ingestion of feed with oocysts
• Predilection seats: Larynx- Esophagus- Diaphragm- Abdominal muscle- Lumber region muscle- Skeletal muscle (heavily infested cases)
• Judgement:
Localized affection condemnation of the affected part
Heavy infestation “T”
• Types (Forms) Sarcosporidia
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Macroscopic |
Microscopic |
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- Buffalo: Balbiana gigantea in the esophagus - Sheep: S. gigantea and S. medusiformis - Pig: S. porcifelis |
- Sheep: S. tenella - Cattle: S. blanchardi and cruzi - Pig: S. miescheriana - Man: • S. humnis (bovis humnis) and S. suihominis (F.H) • S. lindimanni (I.M.H) |
