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The UK Health Security Agency (UKHSA) has suggested that the Live Attenuated Influenza Vaccine (LAIV) vaccine that offers protection to children against flu may also help reduce the rate of group A strep infections. LAIV is a nasal spray offered each season to most children aged 2 and 3 years old, and to school-aged children, to help protect against flu. The new study looked back at data from 2013 to 2017, comparing rates of group A strep (GAS) infections in pilot areas and comparing them to other areas where the vaccine was not being offered as widely. It was found that incidence of GAS was lower in pilot areas where the LAIV vaccine was being offered to all primary school children, compared to areas where it was being incrementally rolled out. The study revealed, in 2 to 4 year olds, rates of GAS were 73.5 per 100,000 children in pilot areas, compared to 93 per 100,000 children in non-pilot areas. In 5 to 10 year olds, rates of GAS were 50.3 per 100,000 children in pilot areas, compared to 57.8 per 100,000 in non-pilot areas.

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."