I'm not sure where you got your information from. Myxedema is a thyroid condition. Myxomatosis, or "the white blindness", affects rabbits only - it has no effect on cats. Also, as the wild brumbies (horses) are also an introduced pest species (and still running wild in certain places in Australia), the rabbits didn't drive them extinct. In fact, we've still got control programs for the brumbies.
Although depending on the time between handling rabbit items here in Aus and getting to your own rabbits, changing your clothes was probably a wise idea. Just like here - when you arrive in Aus, you have to declare whether you were on a farm at all before you landed (and if you were, the officers at the airport will disinfect your boots for you).
My comment about the snakes was just that the snakes did not kill all the rabbits. You're right in that the Australian snakes are native to here, although we are considered one of the remnants of Gondwana (not broken off from it) and the snakes were here when the big part broke up.
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Although depending on the time between handling rabbit items here in Aus and getting to your own rabbits, changing your clothes was probably a wise idea. Just like here - when you arrive in Aus, you have to declare whether you were on a farm at all before you landed (and if you were, the officers at the airport will disinfect your boots for you).
My comment about the snakes was just that the snakes did not kill all the rabbits. You're right in that the Australian snakes are native to here, although we are considered one of the remnants of Gondwana (not broken off from it) and the snakes were here when the big part broke up.