Scientific research about Covid-19 continues to evolve even as the novel coronavirus itself has mutated into the highly transmissible Delta variant that has caused a renewed surge in infections in countries from the UK and the US to those in Africa and Asia. Delta is one of four ‘variants of concern’ listed by the World Health Organisation. Such variants are deemed to be more contagious, more resistant to current vaccines and treatments, or could cause more severe illness. The Delta variant has become the dominant strain causing Covid-19 in many countries. As things stand now, vaccination is considered the most effective measure against the pandemic that has turned life upside down since it
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