Degree Type

Dissertation

Date of Award

2020

Degree Name

Master of Science

Department

Agricultural and Biosystems Engineering

Major

Agricultural and Biosystems Engineering

First Advisor

Chenxu Yu

Abstract

Chronic wasting disease (CWD) is a contagious neurological disease in cervids that belongs to transmissible spongiform encephalopathies (TSEs). Its spread has threatened the healthy growth of wild and farm-raised deer and resulted in adverse population-level impacts. It also raised concerns over the possibility of infecting human beings like bovine spongiform encephalopathy (BSE). CWD is a prion disease that may take as long as two years for visible signs of the disease to appear. Currently, diagnostic tests approved for official CWD are postmortem tests (immunohistochemistry (IHC) and ELISA) which are not suitable for in vivo diagnosis. Raman spectroscopy offers a potential approach to detect and diagnose CWD rapidly in real time as a first screen onsite. With the Raman spectral data, machine learning algorithms could be utilized to extract meaningful information to differentiate the spectroscopic features that underline the signatures associated with the diseases effectively, even with a low signal-to-noise ratio (SNR) Raman spectral data acquired with a portable Raman spectrometer. In this study, in order to evaluate the effectiveness of Raman spectroscopy on CWD diagnosis, Raman spectra were collected by a Raman microscope as well as a portable Raman spectrometer from cervid skin tissue samples collected from both healthy (i.e., control, CWD-negative) and diseased (i.e., CWD-positive) cervids. The spectral data were classified by two machine learning algorithms, support vector machine and artificial neural network. The results suggested that Raman spectroscopy in conjunction with Machine learning can indeed offer a rapid first screening for CWD, with the highest accuracy of 94.4%. It has the potential to become a useful tool for in-field diagnosis and detection of CWD.

DOI

https://doi.org/10.31274/etd-20210114-172

Copyright Owner

Binbin Zhu

Language

en

File Format

application/pdf

File Size

56 pages

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