The head of Germany’s vaccine regulator described the success rate of AstraZeneca’s Covid-19 vaccine as excellent, after some Australian scientists voiced scepticism about its efficacy, Reuters reports.

Speaking during an online press briefing, the president of Germany’s Paul Ehrlich Institute, Klaus Cichutek, said there had been some debate over the best usage pattern for the vaccine.

“Still, the efficacy remains outstanding and excellent,” he said, citing data.