A 14-year-old boy with no underlying health conditions has died from a new inflammatory disease linked to Covid-19.The youngster passed away at Eveline London Children's Hospital, where more than 40 children have now been treated for the 'hyper inflammatory' condition after potentially contracting coronavirus.Parents are now being urged to seek medical advice straight away if they are concerned their child is unwell after a "cluster" of cases were detected in London.The 14-year-old later tested positive for coronavirus, the Mirror reports.Of the first eight children, aged four to 14, who were treated for the condition at Evelina London Children’s Hospital, seven were on a ventilator.Doctors say the condition is similar to Kawasaki disease -