Usually, your immune system keeps an infection limited to one place. This is known as a localised infection.
Your body produces white blood cells, which travel to the site of the infection to destroy the germs causing infection.
A series of biological processes occur, such as tissue swelling, which helps fight the infection and prevents it spreading. This process is known as inflammation.
If your immune system is weak or an infection is particularly severe, it can quickly spread through the blood into other parts of the body. This causes the immune system to go into overdrive, and the inflammation affects the entire body.
This can cause more problems than the initial infection, as widespread inflammation damages tissue and interferes with blood flow.
The interruption in blood flow leads to a dangerous drop in blood pressure, which stops oxygen reaching your organs and tissues.
Sepsis is a life-threatening condition that arises when the body's response to infection injures its own tissues and organs. Common signs and symptoms include fever, increased heart rate, increased breathing rate, and confusion. - wikipedia
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