The best replacement for septicemia is sepsis.

The best alternatives to septicemia are rated as following:
★★★★★  sepsis
★★★★  bacteremia
  severe sepsis
  septic shock
  blood poisoning
  toxemia

Your alternative for septicemia is not listed? Suggest!
Speaking about septicemia, one probably shouldn't forget about dic.

Other search terms related to septicemia and their ratings are:
★★★★★ dic
★★ meningitis
★ endocarditis
You have in mind a companion for septicemia and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of septicemia in all years. Click on graph for more.
septicemia
sepsis
bacteremia