Can uptake of childhood influenza immunisation through schools and GP practices be increased through behaviourally-informed invitation letters and reminders: two pragmatic randomized controlled trials

Table 5 Text for SMS and email reminder messages

Reminder format	Message
SMS (160 characters limit)	Thank you for returning your child’s flu vaccine consent form. If you have not, please return it by xxxxxx to ensure your child doesn’t miss out.
Email	Subject: Flu vaccine consent form due xx/xx/xx: make sure your child doesn’t miss out Dear Parent/Guardian, Please return your child’s flu vaccine consent form by [insert day and date] to make sure your child doesn’t miss out. Thank you to those parents who have already done so. There will be only one vaccination session at the school. Last year, most children offered the vaccine in schools had the immunisation. [The consent form is attached for use if you have lost the letter]^a If you decide you do not want to vaccinate your child against flu, please return the consent form giving the reason. This will help us plan and improve the service Yours sincerely, SIGNED BY PROVIDER

^a This sentence was requested to be included only where it was feasible to include the original letter as an attachment

ISSN: 1471-2458