The invention is directed to a treatment of systemic bacterial, fungal and protozoan infections. The inventive method comprises introducing a DNase enzyme into a circulating blood system of a patient diagnosed with systemic infection caused by bacteria, fungi or protozoa, wherein said DNase enzyme destroys extracellular DNA in said blood of said patient, said DNase enzyme being administered in doses and regimens which are sufficient to decrease the average molecular weight of circulating extracellular blood DNA in the blood of said patient.
