I think part of the rise of whooping cough was attributed to World Youth Day where so many came in for that who come from countries where WC is rife and where they may be carriers of it. Don't forget that Australia is a relatively insular country - we are an island and are somewhat protected because of that, but if you have an influx of people coming from countries where these types of illnesses are common, then you have a huge problem right there. They may not be sick, but they may carry it and how do you test for that? You can't can you.
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