Very interesting! I understand that you live in Australia and that Lyme disease exists there. I lived and practiced in the north east part of US- where Lyme disease is so common now- still tricky to diagnose at times. Lyme disease is included in in a number of evaluations for neurological and rheumatic diseases.
As a curiosity- other father of a friend was one of the first patients diagnosed with Lyme Disease. He lived in Old Lyme, CT. He presented with encephalitis.