This study seeks to elucidate the quantitative expression of G - protein receptor 43/free fatty acid (GPR43/FFA2) receptors in patients with the diagnosis of sepsis and specifically, its expression as it relates to the severity of sepsis. The investigators hypothesize that patients with more severe sepsis, as defined by a higher SOFA (Sequential Organ Failure Assessment Score), will have decreased expression of the GPR43/FFA2 as compared to patients with lower SOFA scores, consistent with a less exuberant immune response to infection.