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AstraZeneca UK has revised the expiry dates for certain batches of Fluenz Tetra nasal spray vaccines as a precautionary measure, after finding that their potency (strength) dropped faster than predicted once thawed, during routine testing. The Medicines and Healthcare products Regulatory Agency (MHRA) has been informed by the manufacturer that the printed expiry date for a limited number of batches is "incorrect." However, the MHRA has assured patients that the affected batches are safe to use and fully effective within the amended expiry date. If the vaccine is administered after the amended expiry date, it may be less effective in protecting against flu, it said. The UK regulatory authority also reiterated that it "keeps the safety of medicines, including vaccines, under review, and acts where necessary to protect patients and the public."