noun. Systemic infection of the blood by pathogenic microorganisms, especially bacteria, that originate from a localized source.

noun. Sepsis.

noun. A disease caused by the presence of pathogenic organisms, especially bacteria, or their toxins, in the bloodstream, characterised by chills and fever.

noun. invasion of the bloodstream by virulent microorganisms from a focus of infection

"And in the next couple of days, they could develop what's called septicemia, which is a blood-borne infection which can kill very quickly."