Study design and settings
PCP, INFLUENZA
This study used an experimental design and a survey design. The experimental design evaluated the effect of PCP recommendation on influenza vaccine uptakes among older participants. The survey design examined changes in knowledge, attitude, and practice of influenza vaccination among older participants before and after the free influenza vaccination policy was implemented.In China, CHCs are responsible for providing vaccination services to urban residents. The study sites were the CHCs in Shenzhen, China. About 5.36% (0.94 million) of the population in Shenzhen are aged 60 years and above [