The one shot Johnson and Johnson's Covid vaccine's been approved for use across the EU.
The European Commission gave the go ahead, just hours after the European Medicines Agency gave the green light for it to be used for people from 18 years of age.
Ireland has an advance purchase agreement for 600,000 doses between April and June.
Health Minister Stephen Donnelly welcomed the move.
Welcome @EMA_News recommendation for COVID-19 vaccine Janssen. Once it gets Commission approval it will become the fourth vaccine authorised for use. Ireland has an advance purchase agreement for 600,000 doses between April and June https://t.co/tkhYwQmHAL
— Stephen Donnelly (@DonnellyStephen) March 11, 2021
In its decision, the agency said: "After a thorough evaluation, EMA's human medicines committee (CHMP) concluded by consensus that the data on the vaccine were robust and met the criteria for efficacy, safety and quality. COVID-19 Vaccine Janssen is the fourth vaccine recommended in the EU for preventing COVID-19."
EMA's executive director, Irish woman Emer Cooke, said: "With this latest positive opinion, authorities across the European Union will have another option to combat the pandemic and protect the lives and health of their citizens.
"This is the first vaccine which can be used as a single dose".
Results from a clinical trial involving over 44,000 people in the US, South Africa and Latin American countries found that this vaccine has a 67% reduction in the number of symptomatic COVID-19 cases after two weeks.