The Norwegian Medicines Agency on Saturday said there were four new cases of serious blood clotting in adults after taking the vaccine.
The Irish National Immunization Advisory Committee (NIAC) made the directive as a precaution though it “has not been concluded that there is any link between the AstraZeneca vaccine and these cases,” it said in a statement.
Ireland’s NIAC is set to meet again Sunday to further discuss the suspension of the vaccine, it added.
Health authorities in Austria were the first to sound the alarm on the potential dangers of the vaccine, suspending on Tuesday one batch of doses.
Italy on Friday banned the use of vaccines from a specific batch of AstraZeneca doses following the death of a serviceman in Sicily, who had died of cardiac arrest one day after receiving his first dose of the vaccine.
The European Union’s medicines regulator, the EMA, is currently investigating whether the shot could be linked to a number of reports of blood clots.
AstraZeneca has robustly defended its vaccine, saying in a statement Sunday that there were no confirmed quality issues for any batch of the vaccine, and “no evidence of an increased risk of pulmonary embolism, deep vein thrombosis (DVT) or thrombocytopenia” for people who had received it.
Ann Taylor, the company’s chief medical officer, was quoted in the statement saying, “Around 17 million people in the EU and UK have now received our vaccine, and the number of cases of blood clots reported in this group is lower than the hundreds of cases that would be expected among the general population.”
“The nature of the pandemic has led to increased attention in individual cases and we are going beyond the standard practices for safety monitoring of licensed medicines in reporting vaccine events, to ensure public safety,” she also said.
European and UK medicines regulators have also said the link between the vaccine and blood clots has not been confirmed and that rollouts should continue.
“There is currently no indication that vaccination has caused these conditions, which are not listed as side effects with this vaccine,” the EMA said in a statement on Thursday.
So far over 110,000 doses of the AstraZeneca vaccine have been administered in Ireland, accounting for roughly 20% of all doses in the country according to state broadcaster RTÉ.
Niamh Kennedy reported from Dublin and Lindsay Isaac reported from London.