Although infectious diseases exist everywhere, in some destinations there is a higher risk of becoming sick Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Australia has just had its busiest month for short-term overseas travel. And there are so many things to consider