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But there have been no similar concerns about the Pfizer and Moderna vaccines.
The latest safety report from Medsafe, the New Zealand Medicines Safety Authority (between Feb 20 - June 5 2021) confirmed there have been 4521 reports of adverse events following immunisation out of a total 744,883 vaccinations.
Of these, 4341 were not serious, while 180 were serious.
Many of the serious reports included allergic reactions, while other issues include reactogenicity reactions (flu-like symptoms), stroke, pulmonary embolism, thrombosis, reduced vision, seizure, facial paralysis and haemorrhage, according to Medsafe.
This information relates to the Pfizer vaccine, which is the only COVID-19 vaccine currently available in New Zealand.