direct to your inboxMore than 140 cases of Covid-19 have been found as part of localised mass testing in Manchester - though none involve a ‘variant of concern’ found in parts of the city so far.Testing programmes in the north and south of the city have been successful in the ongoing efforts to prevent people unknowingly spreading the virus.But public health officials are ‘frustrated’ with the speed at which positive tests are being analysed by laboratories to see if they matched the E484k mutation.E484K is related to the highly infectious Kent strain which has spread rapidly across the UK in recent months - including in Manchester.Around 7,700 people were tested in February and early March when the variant was initially identified in Moss.