The following link shows the potential for the spread of viral diseases in NZ. In this case it was measles picked up on a plane ride back to NZ and then spread through the community due to inadequate immunisation rates. Apparently there are an estimated 30,000 people under the age of 30 not immunised in Auckland alone. Shows how easily polio could spread and why we need to eradicate it completely.
http://www.stuff.co.nz/national/health/5222511/Measles-outbreak-likely-to-spread
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