Hi Shelly,
I've spoke to one of my colleague who looks after this just to check and she hadn't heard of the medicare card. When you take out travel insurance, subject to your policy, you should be entitled to healthcare in the countries that you travel.
As for the numbers currently travelling with you - the Sorrento trip in June is fully booked with 20 travellers.
Australia.... At the moment there are 5 of you on the main tour only, 2 on the main tour with New Zealand add-on, 4 on the main tour with Singapore pre-tour and New Zealand add-on and finally 4 on the main tour with Singapore pre-tour. With a few months to go before departure, I would expect these to change.
Kindest regards,
Julia