The number of Covid-19 cases in Oldham is rising week on week – but it can’t be dismissed as the result of increased testing, the borough’s health chief has explained.Figures released on Tuesday show there has been another spike of 255 cases in the week up to August 8, up from the previous seven days’ total of 137.The infection rate is now standing at 107.5 cases per 100,000 people in the borough – as high as it was during the height of the pandemic in mid April.The council brought back tougher restrictions on residents socialising two weeks ago in a bid to tackle new cases of the virus, and has also ramped up testing.Testing of people in the borough has escalated from an average of around 150 tests a day, up to 800.However the important.