Amsterdam, 22 November 2021 (dpa/MIA) - The European Medicines Agency (EMA) is evaluating an application for a Covid-19 booster jab using US manufacturer's Johnson & Johnson vaccine. The extra dose could be given to people aged 18 and older at least two months after the first one, the EMA said on Monday. The agency expects to make a decision in a few weeks. It has already approved booster jabs with the Pfizer/BioNTech and Moderna vaccines. The EMA experts plan to examine whether such a booster shot increases protection against a coronavirus infection. Data submitted by the manufacturer is to be assessed in an accelerated procedure. The data include results from a trial involving 14,000 adults, who received a second dose of Johnson & Johnson's Covid-19 vaccine or a placebo two months after the initial dose. The Johnson & Johnson vaccine is the only one that requires only one dose and is among the four vaccines approved in the European Union. The EMA stressed that the final decision on the use of booster jabs lies with national governments or health authorities.