We do not truly know how long a disease may stay in the environment after it has been largely eradicated in human beings. Unlike bacteria, which are small single-celled organism, viruses are strands of DNA which have been proven to survive in space vacuum.
Human populations gain immunity at something over 90% of the population vaccinated. The dropping rates of vaccination are A worry as they may allow some of these diseases that we thought were historic can re-emerge. Polio is a good example ..
http://www.health.govt.nz/your-healt...-poliomyelitis
I'm sure you were vaccinated against polio - I wonder just how many of our kids born now will be and what will happen if it resurfaces in New Zealand? It will be too late once we start getting new cases here.
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