Expert warns Sefton could be next to face new Covid measures to fight Indian 'Delta' variant Sefton has seen Covid infections start to surge again, with the Delta variant accounting for around a fifth of new cases 10:21, 10 JUN 2021 Updated Sefton has already seen one round of surge testing, but an expert has warned more could be on the way as the Indian variant remains prevalent. (Image: Julian Hamilton/Daily Mirror) Sefton could be next in line for tougher measures to combat the Indian variant, an expert has warned. Professor David Livermore, an epidemiologist at the University of East Anglia, said the continuing prevalence of the variant meant more surge testing and stricter travel advice could be on the way in a number of areas.