Scholarly Communications Project


Correlation of Environmental Temperature, Precipitation, and Humidity with Salmonella Culture Results from Cattle in Virginia

by

Kwankate Kanistanon

Master's Thesis submitted to the Faculty of the Virginia Tech in partial fulfillment of the requirements for the degree of

Master of Science

in

Large Animal Clinical Sciences

Approved

Dr. Kevin D. Pelzer, Co-Chair
Dr. Lorin D. Warnick, Co-Chair
Dr. Jerry R. Roberson

March, 11, 1997
Blacksburg, Virginia


Abstract

Records of bovine samples submitted for salmonella cultures at four regional diagnostic laboratories in the state of Virginia were used to investigate the association of weather conditions and the diagnosis of salmonellosis in cattle. Spearmanšs correlation coefficients were calculated for the correlations between the monthly number of samples positive for salmonella culture and weather parameters: temperature, precipitation, and relative humidity. Significant correlation coefficients between the monthly average temperature and the monthly number of positive samples were found to be negative in one laboratory (rs= -0.38, p=0.03) and positive in one laboratory (rs=0.30, p=0.02). The latter correlation coefficient was found between the monthly average temperature and the monthly number of positive samples the following month. The same laboratories that had significant correlation of the monthly number of positive samples and the monthly average temperature also had significant correlation with the monthly average relative humidity (rs= -0.39, p=0.03 and rs=0.37, p=0.004). The monthly average relative humidity was more highly correlated to the number of positive samples reported in the same month for both laboratories that had significant correlation coefficients. None of the correlations between the monthly precipitation and the monthly number of positive samples were significant (p>0.05). The inconsistent directions of correlation coefficients need to be investigated further to find a reason for the discrepancy between regions of the state.


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Date item approved:
03/11/97

Fees:
Archiving fee received.