The variant which originated in India now makes up about 90% of new COVID-19 cases in the UK. It is 60 per cent more transmissible than the Alpha strain which caused the super surge in cases around the Christmas and the New Year. How concerned should we be then by the Delta variant? That’s the question Treasa Murphy asks Professor Mary Horgan, president of the Royal College of Physicians of Ireland. The Tralee woman is also a consultant physician in infectious diseases and internal medicine at Cork Universi