The Uptake of the Influenza Vaccine in Patients With Cystic Fibrosis: A Retrospective Study.

Background: Children with cystic fibrosis are more likely to become severely unwell with influenza-associated illness compared to children without chronic lung disease. The provision of accessible influenza vaccinations is essential in the prevention of infection.

Objectives: To describe the prevalence of the influenza vaccine uptake in children with cystic fibrosis from 2016 to 2020 at a single tertiary paediatric hospital site and determine if the COVID pandemic of 2020 and the introduction of telehealth encounters affected the vaccine uptake.

Methods: A retrospective study of children with cystic fibrosis aged 6 months to 18 years who reside in South Australia was performed using the Women's and Children's Hospital (WCH) Respiratory Department cystic fibrosis database from 2016 to 2020. The Australian Immunisation Register (AIR) was used to determine vaccination status during this period.

Results: One hundred and eighty two children with cystic fibrosis were identified, one hundred and seventy two of whom vaccination records were available on the Australian Immunisation Register. Proportion of eligible patients who were vaccinated ranged from 66% to 88% in the years 2016-2019. There was no significant decrease in uptake during the COVID-19 pandemic in 2020 (75%). Despite the introduction of Telehealth reviews in 2020 majority (66%) of patients continued to have exclusive face-to-face appointments, of which 73% received the vaccination. Vaccination coverage of those who received combination of Telehealth and face-to-face was 81%.

Conclusion: The high influenza vaccination rate of South Australian children with cystic fibrosis is consistent with rates seen in other tertiary centres globally. This study demonstrated that the pandemic and introduction of Telehealth appointments did not have any impact in the uptake of the influenza vaccination in our South Australian population.