With the Rhus [related to PI] I mentioned earlier, it never bothered me for years until once in Autumn. It seemed to be the sawdust for me but the homeowner, from the US was a mess long before I got there.
As for Lyme disease you're pretty safe Bermy, bit of a news thing at the moment to take peoples minds of something else.
Couple of cases in Western Australia, but most existing cases brought in from Asia. There's been a pretty good checkup going on, ticks here don't carry it yet and hopefully won't.