Sepsis

from WordNet (r) 3.0 (2006)

sepsis
    n 1: the presence of pus-forming bacteria or their toxins in the
         blood or tissues

from The Collaborative International Dictionary of English v.0.48

Sepsis \Sep"sis\, n. [NL., fr. Gr. ??? putrefaction.] (Med.)
   The poisoning of the system by the introduction of putrescent
   material into the blood.
   [1913 Webster]