Coronavirus on their way following a surge of 230 million global cases a day. Researchers say that the more people that catch the virus, the more opportunity it has to evolve - leading to more infectious variants.In the US alone three homegrown strains have been spotted, less than 24 hours apart.Trevor Bedford, a scientist at Fred Hutchinson Cancer Centre, posted a thread on Twitter outlining his thesis.The expert said: "After ~10 months of relative quiescence we've started to see some striking evolution of SARS-CoV-2 with a repeated evolutionary pattern in the SARS-CoV-2 variants of concern emerging from the UK, South Africa and Brazil."…My (highly speculative!) hypothesis is that the emergence of these variant viruses arises in cases of.