The 54-year-old Australian cricketer is hospitalised in Brisbane to treat meningitis infection.
It's an inflammation of the membranes around the brain and spinal cord.
Fever, neck stiffness, confusion, loss of appetite, and light sensitivity are the common symptoms of the condition.
Meningitis can be life-threatening, and there are many types. The most common is bacterial meningitis.
Those over 65 years and under 5 years of age are the most at risk for the disease.