Unit 4 - Diagnostic Tools Flashcards
In pigs, what blood vessels are you aiming for?
The anterior vena cava or jugular
The number of animals to test depends on what?
Number of animals in a peer group
Minimum detection limit
Probability of detection
Test sensitivity and specificity
How do you determine the number of animals to test?
Look it up in a text book
Calculate in a spreadsheet
Special computer programs
What does ‘95 - 10 sampling = 30 head’ mean?
If you want to sample a population with at least a 10% disease prevalence and you want to be confident that you can find at least 1 positive animal in the group, you need to randomly test 30 head
If 95-10 = 30, then 95 - 5 sampling = ____ head.
60 head
Testing 10 head gives you __% confidence as long as the disease prevalence is at least ____%.
90%
25%
How is individual pig sampling done?
Take serum, blood swab, and/or tonsil scrapings
How is population-based sampling done?
Use oral fluids and processing fluids
Do litter oral fluids or family oral fluids have a higher success rate in detecting disease?
Family oral fluids
What are pigs evaluated for at slaughter?
Pneumonia, atrophic rhinitis, mange, and liver scars due to migrating ascarids
What should be assessed when examining the lungs at slaughter?
Assess the percentage of the lung surface exhibiting pneumonia
When assessing the severity of atrophic rhinitis, what should be noted?
The severity of turbinate atrophy and septal deviation
What region is most often affected by atrophic rhinitis?
Ventral scroll of the ventral turbinate
Scoring of atrophic rhinitis is based on what?
The amount of space
What are milk spots?
Scars on the liver that are indicative of ascarid migrations
