L11&L12: Food borne zoonoses PART I and PART II Flashcards
What are the Kosher dietary rules?
Meat cannot be eaten with dairy, can’t eat shellfish, no pork
What is Shechita?
Ritual slaughter
What is done at PM exam for Shechita?
Ensure lungs free of adhesions
Which season does Crypto peak in?
Spring
What is infective dose like in Crypto and Giardia?
Low
How can you destroy Crypto and Giardia?
Pasteurisation and freezing but not chlorine
Where can you catch Giardia and crypto?
Water and unprocessed food
What are symptoms for giardia and crypto?
Watery diarrhoea, fever for 1-2 weeks
Which species get Trichinella?
Pigs and horses, get from rats
How long can Trichinella survive in humans?
30 years
Why do cultural habits affect Trichinella?
Cooking kills but curing, drying, smoking, fermenting don’t
How many days of abdominal symptoms do you get with Trichinella?
1-2 days
What symptoms do you get for 2-8 weeks in Trichinella?
Headaches, fever, chills, cough, eye swelling, joint/muscle pain, itchy
What affects severity in Trichinella?
Number of worms
Where do you take samples to test for Trichinella?
Pig diaphragm, horses tongue
Whose responsibility is the on-site lab?
OV
Which are the only pigs you test for Trichinella in?
Outdoor pigs
What do you do to the pooled sample to detect Trichinella?
Use a magnetic stirrer
Which methods kill Trichinella in pigs?
Freezing
How many recognised freezing methods are there in pigs?
3
How long do C bovis eggs survive?
Less than 6 months
How does C bovis contamiante pasture?
Floods of sewage
How long after infection are C bovis cysts infective for?
10 weeks
How long are C bovis cysts viable for?
Less than 9 months
What are clinical signs of C bovis?
Minor weight loss
How do you test for C bovis?
Incise masseters and heart
What do you do if local infection of C bovis?
Freeze the carcase and only dispose of the infected part depending on if it is viable or non-viable
What causes neurocysticercosis?
Taenia solium
How does Diphyllobothrium spread to humans?
Crustacean to fish to human
What is the usual spread of anisakiasis?
Crustacean to fish to marine mammals
How do humans become incidental host of anisakiasis?
Eating raw or undercooked sea food
Is scrapie a risk to human health?
No
Before what year are cattle banned from the food chain?
1996
What are some examples of unprocessed food?
Sliced, boned, minced, ground, skinned, chilled, frozen, cleaned, husked
What are some examples of processed food?
Heating, smoking, curing, drying, marinating, extraction, extrusion
Which parasites will freezing kill in pig?
Taenia solium and Trichinella
Which methods will not kill Taenia and Trichinella?
Curing, smoking, drying, marinating etc
Which crypto species are the most common?
Hominis in human, parvum in humans and animals
What are the sources of toxoplasma infection?
Raw meat, contaminated water, cat faeces, blood transfusion, congential, contact with lambing material
