Why do people with a total lack of basic understanding pass themselves off as experts? Most young Australians do NOT have natural immunity as you suggest. The only way to gain immunity (which is in effect 'remembering' the threat) is to have exposure to the virus or vaccine. There is some conjecture that a small number already have a certain level of T-cell activity caused by other very similar viruses acquired in the past but this has nothing to do with age.
Is this where you do some more Google searches and post more conspiracy theory links?
