A computer-implemented method of identifying a pathogen likely causing an increased somatic cell count in a sample of fluid is described. An image of the sample of fluid is received. Pixels in the image are parsed to identify pixels representing somatic cells. The identified pixels are analyzed to determine image parameters. The determined images parameters are compared with different sets of predefined pathogen parameters stored in memory to determine a match. Each of the sets of pathogen parameters represents a different one of a plurality of pathogens. The pathogen likely causing an increased somatic cell count is identified by the set of the pathogen parameters that matches the image parameters. A computer readable medium storing instructions to implement the method and a system configure to implement the method are also described.