| Studies | Site | Journal | Title | Aims & Objectives | Numbers of participants | Methods | Qualitative data collection | Analysis |
| Teo et al., 2019 | Singapore | Vaccine | Attitudes and perception of influenza vaccines among older people in Singapore: a qualitative study. | To explore the obstacles and intentions behind order’s decision to flu vaccinations and assess their knowledge of it. | 15 | Qualitative | Individual | Thematic content analysis |
| Cummings, Kong, & Orminski, 2020 | Singapore | PLOS ONE | A typology of beliefs and misperceptions about the influenza disease and vaccine among older adults in Singapore. | To identify the most noticeable and essential misperceptions about influenza and the flu shot among Singapore’s older people. | 76 | Grounded theory | Semi-structured interviews | Content analysis |
| Siu, 2018 | Hong Kong | The Gerontologist | Perceptions of seasonal influenza and pneumococcal vaccines among older Chinese adults. | To explore the perceptions and obstacles related to flu shots and pneumococcal vaccinations among Chinese elders. | 40 | Qualitative | Individual | Microsphere analysis |
| McIntyre, Zecevic, & Diachun, 2014 | Canada | Canadian Journal on Ageing | Influenza vaccinations: Older adults’ decision-making process. | Exploring the self-perceived influences among older Canadian adults in deciding whether to take or not take the flu shot. | 37 | A qualitative cross | Semi-structured interviews | Content analysis |
| Rikin et al., 2018 | USA | Journal of Community Health | Influenza vaccination beliefs and practices in elderly primary care patients. | To identify which influenza vaccine-specific beliefs are related to vaccination. | 200 | sectional design | Individual | Content analysis |
| Kaljee et al., 2017 | USA | Human vaccines & immunotherapeutics | You need to be an advocate for yourself: Factors associated with decision-making regarding influenza and pneumococcal vaccine use among US older adults from within a large metropolitan health system. | To enhance understanding of obstacles and enablers to vaccinating in older cohorts within the context of general healthcare availability and accessibility, social networks, information sources, and individual perceptions of diseases and vaccines. | 48 | Mixed methods | Semi-structured interviews | Content analysis |
| Briggs et al., 2019 | Australia | therapeutics | Perceptions of influenza and pneumococcal vaccine uptake by older persons in Australia. | To understand the varied perspectives of older Australians on flu vaccines. | 36 | Qualitative | Focus groups | Thematic analysis |
| Sun et al., 2020 | Hong Kong | Vaccine | Seasonal influenza vaccine uptake among Chinese in Hong Kong: barriers, enablers, and vaccination rates. | To explore the updated seasonal flu vaccination rates among Chinese in Hong Kong after subsidy programs were implemented these years and the public’s obstacles and facilitators to vaccination. | 54 | Qualitative | Semi-structured interviews | Content analysis |