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Number of cats over the ELISA S/P ratio (%), for 58 farm cats, 73 pet cats and 52 feral cats. For farm cats, the distribution of cats is shown according to the C. burnetii-status of the farm of origin, where a negative farm was ELISA-negative and -qPCR-negative. One farm cat is missing on the graph due to a missing value for farm status. The vertical dashed lines represent the ELISA cut-offs and separate C. burnetii-ELISA-negative, -doubtful and -positive cats.
