slide1
Download
Skip this Video
Download Presentation
Comparison of sample types and location of skin biopsies for BVDV detection using antigen capture ELISA Testing

Loading in 2 Seconds...

play fullscreen
1 / 18

Comparison of sample types and location of skin biopsies for ... - PowerPoint PPT Presentation


  • 122 Views
  • Uploaded on

Comparison of sample types and location of skin biopsies for BVDV detection using antigen capture ELISA Testing. Dr. Brian Vander Ley BVD Symposium January 26, 2009 Phoenix, Arizona. Introduction. We are looking for ways to screen for PI animals more effectively Sample choices

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Comparison of sample types and location of skin biopsies for ...' - arleen


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Comparison of sample types and location of skin biopsies for BVDV detection using antigen capture ELISA Testing

Dr. Brian Vander Ley

BVD Symposium January 26, 2009

Phoenix, Arizona

introduction
Introduction
  • We are looking for ways to screen for PI animals more effectively
    • Sample choices
    • Assay evaluation
    • Assay development
overview
Overview
  • 2 Projects
    • Sample project
      • 40 PIs
      • Several different samples evaluated
    • Hide project
      • 3 PIs
      • Involved systematic evaluation of whole hides for BVDV antigen
sample project
Sample Project
  • 40 PI calves in 2 stocker operations in Oklahoma
    • Identified by ACE
    • Segregated from non-PI herdmates
skin samples
Skin Samples
  • 3 ear notches
    • IHC
    • ACE
    • One was archived for future use
  • 1 tail fold biopsy

Above: Ear notcher with ear notch. Below: tail fold

Photo from: www.drugs.com/vet/images/1136000a.png

swab samples
Swab Samples
  • Nasal
  • Oral
  • Conjuctival
  • Vaginal/Preputial
  • Rectal

Collecting an oral swab

Photo from: www.puritanmedproducts.com

sample processing
Sample Processing
  • Skin Samples
    • Placed in dry tubes and frozen until testing
    • Incubated in 1 mL PBS for 24 hours at 4°C prior to using ACE
  • Swab Samples
    • Collected and place immediately in 1 mL PBS then frozen
    • Thawed and allowed to incubate for 24 hours 4°C prior to ACE
results
Results
  • Accuracy reported as a percentage: # positive of sample type divided by # positive IHC.
  • Accuracies
    • Ear notch-98%
    • Tail biopsy-98%
    • Nasal swab-98%
    • Vaginal/Preputial swab-90%
    • Conjunctival swab-63%
    • Rectal swab-10%
    • Oral swab-8%
sample conclusions
Sample Conclusions
  • Nasal swabs could be a good sample for detecting PI cattle.
    • Simple
    • Non-invasive
  • Other samples could also be good, but would pose some challenges
  • More work would need to be done to validate any of these samples
hide project
Hide Project
  • 3 PIs selected based on previous diagnosis as PI by ACE
  • Each animal was euthanized and the skin was removed in its entirety

A complete hide

hide project1
Hide Project
  • Each hide was quartered in the field and packed on ice
  • The hides were frozen until processing

Quarter division of hides

hide processing
Hide Processing
  • Each quarter was thawed and divided into 10 cm by 10 cm sections
  • A 4 mm punch biopsy was taken from each section and placed in a dry microcentrifuge tube.

Hide section schematic

sample evaluation
Sample Evaluation
  • All samples were incubated in 1 mL PBS at 4°C for the same amount of time.
  • All steps were performed the same way on each plate and in sequential order from plate 1 to plate 7.
  • Multiple controls were used in each plate
    • Kit positive control
    • Kit negative control
    • Titered BVDV infected cell culture
    • Titered BVDV infected cell culture diluted 1:10 in PBS
results1
Results
  • All sections were positive by ACE
  • No significant differences in S/P ratios were found
    • Between one particular quarter in all three hides
    • Between quarters on an individual
    • Between animals
conclusions
Conclusions
  • Large amounts of sample material are available for evaluation/development of diagnostic assays aimed at detecting PI cattle.
  • The whole hide can be utilized as a source of samples for running the ACE.
overall conclusions
Overall Conclusions
  • BVDV Antigen can be recovered from a variety of places.
    • Many swabs
    • Essentially any haired skin sample
  • There are large amounts of material that can be harvested from an individual animal for evaluation or development of diagnostic assays, especially those that use skin.
  • More research needs to be done to validate any of the samples.
references
References
  • Idexx Herdchek® Bovine Virus Diarrhea Antigen Test Kit. U.S. Vet. License No. 313. 2007.
slide18
Questions?

Thank You

ad