Last modified on Thu 28 Jan 2021 18.58 EST German authorities have advised that the Oxford/AstraZeneca jab should not be given to those aged 65 or above. We take a look at why, and what experts make of it. Why has Germany advised the Oxford/AstraZeneca jab should only be used in adults under 65? The issue boils down to a lack of data on efficacy of the vaccine in this age group. The standing committee on vaccination of the Robert Koch Institute, Germany’s disease control agency, said: “There is insufficient data to judge how effective the vaccination is above 65 years.” Writing in their Lancet study released last year, researchers said there were not enough Covid cases among older adults at the time to explore just how well the vaccine protected them against the disease.