What is the difference between sepsis, septicaemia and blood poisoning?

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Blood poisoning or septicaemia are both terms which refer to the invasion of bacteria into the bloodstream causing severe infection. Sepsis is a more rare, but serious complication of infection. It can lead to multiple organ failure and even death, sometimes without blood poisoning or septicaemia. The main cause of sepsis is usually bacterial infection, although sepsis can sometimes be due to fungal or viral infection ( like COVID-19). You can find out more about sepsis here.