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To curtail spread of COVID-19-update By Dr Harold Gunatillake   Coronaviruses have been causing problems for humanity for a long time. Several versions are known to trigger common colds and more recently two types have set off outbreaks of deadly illnesses: severe acute respiratory syndrome (Sars) and Middle East respiratory syndrome (Mers). The present virus that kills people is a Sars-CoV-2 the virus that causes Covid-19 a deadly strain of a virus. But their impact has been mild compared with the global havoc unleashed by the coronavirus that is causing the Covid-19 pandemic. In only a few months it has triggered lockdowns in dozens of nations and claimed more than 100,000 lives. And the disease continues to spread. How does it spread? The present corona virus is a spiky ball of genetic material coated in fatty chemicals called lipids. ...