Scientists say vaccines alone are not currently enough to stop coronavirus spreading, and other measures are needed
The problem is that no single measure to prevent the spread of coronavirus is 100% effective, and that includes vaccines.
Vaccines are widely regarded as the most powerful weapon in our Covid-19 armoury. Some are more than 90% effective and prevent people getting very sick with the virus and needing hospital care. Fresh air cuts the risk of infection and the ultraviolet radiation from sunlight can destroy virus left on surfaces. But the risk outside is not reduced to zero.
Australian virologist Ian Mackay, the first to use the Swiss cheese model in relation to the pandemic, says, in reality, the cheese's holes will constantly open, shut and shift location depending on our behaviour. None of the slices is perfect. Each of them has holes - representing the measure's flaws - which allow the virus to find a way through.Let's take a look at each cheese slice in turn.Vaccines are widely regarded as the most powerful weapon in our Covid-19 armoury. Some are more than 90% effective and prevent people getting very sick with the virus and needing hospital care.
Keeping 2m away from someone reduces the chance of the virus passing on. But we can still catch it even from further away.Fresh air cuts the risk of infection and the ultraviolet radiation from sunlight can destroy virus left on surfaces. But the risk outside is not reduced to zero.The chance of catching the virus increases in areas that are poorly ventilated. The greater the airflow, the lower the risk, but the danger is still there.
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