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New South Wales has temporarily paused administration of the AstraZeneca vaccine to all age groups at its state-run clinics.

NSW Health expects vaccinations will resume later today for people aged over 50 once consent information is updated.

Prime Minister Scott Morrison and national health authorities last night announced the Pfizer vaccine is now the preferred vaccine for most Australians aged under 50 after concerns about rare blood clots linked to the AstraZeneca vaccine.