Adult flu vaccination coverage
England time series: It is important to note that influenza vaccine uptake data is only a snapshot of the registered GP patients vaccinated at the time of data extraction/end of the data collection. Data captured at the time of data extraction will exclude for example updates to patient records on vaccination status or newly registered patients or changes in clinical risk status. For example, patients who are vaccinated, but have not had their electronic patient record updated by the time of data extraction, will be included within the denominator, but will not be included in the count of ‘number vaccinated’. For more information, please see Public Health England's Seasonal influenza vaccine uptake in GP patients: winter season 2017 to 2018 report.
OECD data: Influenza vaccination rates refer to the number of people aged 65 and over who have been received an annual influenza vaccination, divided by the total number of people over 65 years of age. In some countries, the data are for people over 60 years of age. The main limitation in terms of data comparability arises from the use of different data sources, whether survey or programme, which are susceptible to different types of errors and biases. For example, data from population surveys may reflect some variation due to recall errors and irregularity of administration. The definition and combarability information are taken directly from the OECD report Health at a Glance 2017. Detailed information about the definitions, source and methods for each country can be found here.