Oxford and AstraZeneca rely on outsourced companies to help create doses Chris Whitty said vaccine availability issues will 'remain case for several months' Government have pledged to give single doses of Pfizer jab to ration supplies But manufacturers of Pfizer and Oxford/AstraZeneca jabs have rubbished claims Scientists have blamed the vaccine's slow roll-out on the government's lack of investment and neglect of manufacturing. Sir John Bell, a regius professor of medicine at Oxford University and member of SAGE (Scientific Advisory Group for Emergencies), said that insufficient investment in the capacity to make vaccines has left Britain unprepared. ADVERTISEMENT He accused successive governments of failing to build onshore manufacturing capacity for medical products, with Oxford/AstraZeneca counting on outsourced companies to help create doses, such as Halix in the Netherlands, Cobra Biologics in Staffordshire and Oxford Biomedica.