Public Health England. The worst hit area of Oldham is Alexandra Park where 1,112 confirmed cases have been reported since March - which means at least one in 11 of the local population in that area has been infected and tested positive.Werneth has been hit hard too with one in 13 people testing positive since March.Of course Oldham is not the only area to have been severely impacted by Covid-19.One in 20 people have tested positive for the virus across Manchester with student areas the worst hit, according to PHE data.The true number of people catching the virus will be higher because only NHS patients were tested during the first months of the pandemic before community 'Pillar 2' testing was started.The figures will also slightly.