In the UK, the influenza vaccination contains pork.
The nasal flu vaccine does contain hydrolysed gelatine derived from pork as one of its additives. Gelatine is commonly used in a range of pharmaceutical products, including many capsules and some vaccines. The gelatine used in Fluenz is a highly purified product used to stabilise live viral vaccines. https://www.google.com/url?sa=t&source=web&rct=j&url=https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/364143/Influenza_vaccine_and_porcine_gelatine_2.pdf&ved=2ahUKEwiHvdTR2cbsAhWIJcAKHeqmD_sQFjABegQIARAF&usg=AOvVaw1i84mTUXfbE9X9gEoK2vBh&cshid=1603318356030
Is this a Kashrus problem?
The vaccine is administered to children via nasal spray (not sure if it makes a Halachic difference)