EU nations are limiting the use of AstraZeneca vaccines to older age groups, as the bloc struggles to agree on a uniform guideline.
Belgium's health officials have agreed to restrict the vaccine to those over 55 for a month, while Italy's health minister announced Wednesday that the shot should be offered only to those 60 and over.
Finland and Sweden are making the vaccine available only to those 65 and older.
Germany has recommended that those under 60 that have received the first AstraZeneca shot, should receive a different second dose.
The differing guidelines come as EU health ministers failed to agree on a coordinated approach during a meeting Wednesday, despite a plea by Portugal, which holds the bloc's rotating presidency,. which called for common ground.
Portugal recommends that the AstraZeneca vaccine should only be used for those 60 and over.
Countries outside the EU have also responded to the EMA's findings.
Australia now recommends use of Pfizer's vaccine for people under 50.
However, Paul Kelly, the nation's Chief Medical Officer, says those who have already had the first AstraZeneca dose without any serious adverse events "can safely be given a second dose."
Unrelated to the reports of blood clotting,.. the African Union on Thursday decided to halt plans to secure AstraZeneca vaccines, citing supply concerns from India's Serum Institute.
The African Centers for Disease Control and Prevention will instead seek the single-shot vaccine from Johnson and Johnson.
The AU's disease control unit stressed the decision had "nothing to do" with European concerns about blood clots.
Lee Seung-jae, Arirang News.