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Firefighters already face higher levels of some illnesses, such as autoimmune diseases, asthma and some cancers, she said.

The 25-year-old back row spent 25 days in an induced coma after being diagnosed with autoimmune encephalitis, which occurs when the body's immune system mistakenly attacks the brain.

Among them were the wife and children of Dale Robertson, who used a ventilator after being diagnosed with Guillain-Barré syndrome, a rare and paralyzing autoimmune disorder.

Prof Isaacs said, if its successful, the research could also have implications for other autoimmune diseases such as diabetes or multiple sclerosis.

It was some achievement to do so in the year she turned 39, having been diagnosed with Sjogren's syndrome, external - an autoimmune condition which can cause fatigue and joint pain - a few years earlier.