The Corona virus is highly infectious and can be passed on without the vector (the person spreading the infection) showing any symptoms at the time.
The other reason why this virus is so scary is that, unlike influenza, it can be fatal even to some young, fit and healthy individuals.
So, when considering any population (e.g. an island or a country or a state), the only way that the infection can be stopped is either a significant proportion of that population develops an immunity OR we quarantine EVERY INDIVIDUAL IN THE COUNTRY until there is no further sign of infection. If a population has been locked down in this way however, it only takes one 'foreign' visitor to re-infect the whole country again!
I say a 'significant number', because if an infected person arrives into the country from somewhere-land, they will only be able to pass on the virus if they come into contact with another person who is not already immune. So if 70% of the population are immune, then the virus is not likely to infect anyone else as long as the visitor is quarantined as soon as they show any symptoms (or at least only infect 1 or 2 others at most who are also quickly quarantined).
So, for the sake of argument, let us say that the critical point is when 70% of the population develop immunity, then we can all go back to living virtually normal lives and the virus should die out as it can only survive for approximately 72 hours (or just a few minutes if you stick them in a microwave!).
The other reason why this virus is so scary is that, unlike influenza, it can be fatal even to some young, fit and healthy individuals.
So, when considering any population (e.g. an island or a country or a state), the only way that the infection can be stopped is either a significant proportion of that population develops an immunity OR we quarantine EVERY INDIVIDUAL IN THE COUNTRY until there is no further sign of infection. If a population has been locked down in this way however, it only takes one 'foreign' visitor to re-infect the whole country again!
I say a 'significant number', because if an infected person arrives into the country from somewhere-land, they will only be able to pass on the virus if they come into contact with another person who is not already immune. So if 70% of the population are immune, then the virus is not likely to infect anyone else as long as the visitor is quarantined as soon as they show any symptoms (or at least only infect 1 or 2 others at most who are also quickly quarantined).
So, for the sake of argument, let us say that the critical point is when 70% of the population develop immunity, then we can all go back to living virtually normal lives and the virus should die out as it can only survive for approximately 72 hours (or just a few minutes if you stick them in a microwave!).