Updated

Updated · Cambridge University Hospitals · Jun 17

Addenbrooke’s Researchers Identify 4 Necrotising Fasciitis Red Flags as Disease Kills 1 in 4

Updated

Updated · Cambridge University Hospitals · Jun 17

Addenbrooke’s Researchers Identify 4 Necrotising Fasciitis Red Flags as Disease Kills 1 in 4

Q: If caused by common bacteria, what is the mysterious trigger that makes an infection turn 'flesh-eating'?

There is no single mysterious switch. When common bacteria such as Group A Streptococcus turn “flesh-eating,” it is usually because a dangerous mix of bacterial toxins, deep tissue invasion and a vulnerable host allows the infection to race through the fascia, the tissue beneath the skin. The bacteria can enter through even a small or unnoticed break in the skin. In rare cases, once they reach deeper soft tissue, they release toxins and enzymes that destroy tissue, damage blood vessels and help them evade immune attack. That loss of blood supply is critical: it starves tissue of oxygen and makes it harder for antibiotics and white blood cells to reach the infection, so the damage can spread with alarming speed. Who gets severely ill also matters. The Addenbrooke’s study and wider evidence show the risk is higher in people with diabetes, weakened immunity, older age, obesity, and heart or kidney disease. In those patients, the body may struggle to contain what began as an ordinary bacterial infection. Researchers also found that while high white blood cell counts are a classic warning sign, a low count in a very sick patient can mean the immune system is overwhelmed. That is why necrotising fasciitis is so hard to predict early: common bacteria are involved, but the outcome depends on where they get in, what virulence factors they deploy, and how well the patient’s immune system can respond. Rapid surgery and antibiotics remain the key to survival.

3 articles · Updated · Cambridge University Hospitals · Jun 17

Addenbrooke’s researchers said age, immunosuppression, heart or kidney disease, and unexpectedly low white-cell counts can help flag necrotising fasciitis patients at highest risk.
The findings come from a review of 87 patients treated between January 2015 and March 2025, alongside analysis of surgery timing, antibiotics and intensive-care support against survival outcomes.
The team said the low white-cell-count signal may reflect immune exhaustion in severe sepsis, adding to the LRINEC scoring tool clinicians already use to assess the fast-moving infection.
Necrotising fasciitis still kills about 1 in 4 patients and can rapidly progress to septic shock and multi-organ failure, making early diagnosis, wide surgical excision and ICU support critical.