Abstract: A system for detecting a disease agent in a sample derived from a patient biofluid may comprise a receiver coupled to a communication network and a controller coupled to the receiver. The controller may comprise a processor and a memory. The controller may be configured to generate an infrared spectrum of the sample. The sample spectrum may comprise one or more sample spectral components, the sample spectral components comprising a sample wavenumber and a sample absorbance value. A set of reference spectral models may comprise one or more reference spectral components. The reference spectral components may comprise a reference wavenumber and a reference absorbance value. The reference spectral components may comprise one or more pathogen characteristics associated with sepsis. The one or more sample spectral components may be classified as pathogenic using the reference spectral models. Pathogen data may be generated using the classified sample spectral components.