The presence of bacteria in the bloodstream, which is normally sterile. It can be transient and harmless or lead to serious infections like sepsis.
From 'bacteria' (Greek 'bakterion' meaning 'small rod') combined with Greek 'haima' meaning 'blood.' The term was coined in the late 19th century as medical understanding of bloodborne infections advanced.
Bacteremia is like having uninvited guests in your bloodstream - sometimes they just pass through quietly (like after brushing your teeth), but other times they decide to throw a destructive party that becomes sepsis! Your blood is supposed to be sterile, so any bacterial presence is technically abnormal.
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