Originally Posted by
ryanbryan
That, and I guess they are also high risk areas determined by AQIS, in terms on bringing back pests etc. harmful to Australian plants and wildlife.
It's not a big deal to tick it, but it probably also makes you more likely (if not certain) to have your baggage checked - also not a big deal if you've got nothing to hide/done nothing wrong.
This question won't have any impact on your luggage being checked. It's completely Yellow Fever related. The real give-away is the "6 days", which is the normally accepted maximum time it takes for Yellow Fever symptoms to appear.
If you tick it they will ask what countries in those areas you've been in recently, and if it appears on the list of countries listed
here then you will be asked to show proof of immunization against yellow fever.
(Caribbean is listed only due to Trinidad and Tobago, despite being shown under "South America & Central America" on that list)