There has been a 10% rise in sepsis infections across Welsh NHS hospitals, according to figures obtained by Welsh Conservatives.
The infection occurs when the body's response to an infection injures its own tissues and organs, and it can lead to shock, multiple organ failure and death, especially if not recognised early.
Despite this rise the number of deaths from Sepsis actually fell by 5%. In total, 5,183 deaths were recorded over the three year period.
Shadow Health Secretary Angela Burns who had the infection and says it 'hits patients like a car crash' is now calling for mandatory training to be provided to frontline NHS staff to help them spot the signs of the infection.