Vulnerable groups identified and their frequency count in the final pool of papers
| Age (25) | Adolescents | 6 | Social status (32) | Poor | 9 |
| Young adults | 6 | Racial/ethnic minority | 9 | ||
| Elderly | 6 | Social disparity | 5 | ||
| Children | 5 | Homeless | 5 | ||
| Infants | 2 | Slave labor | 1 | ||
| Occupation (24) | Healthcare workers | 12 | Food insecure | 1 | |
| Sex workers | 6 | Disabled | 1 | ||
| Military personnel | 2 | Orphans | 1 | ||
| Female humanitarian workers | 1 | Mental health (23) | Injection drug users (IDU) | 14 | |
| Micro-farmers | 1 | Drug users | 5 | ||
| Nannies | 1 | Mental health | 3 | ||
| Unemployed | 1 | Developmental disabilities | 1 | ||
| Living conditions (11) | Rural settlements | 4 | Physical health (20) | Pre-existing conditions | 6 |
| Immunocompromised | 4 | ||||
| Nursing home residents | 3 | Unvaccinated | 3 | ||
| Informal settlement residents | 1 | Comorbidity | 2 | ||
| Remote/offshore operations | 1 | Pregnant women | 2 | ||
| University residences | 1 | Dialysis patients | 1 | ||
| Homebound patients | 1 | TB patients | 1 | ||
| People on the move (21) | Refugees/IDPs* | 12 | Critically ill | 1 | |
| Gender/Sexual orientation (25) | Homosexual men | 13 | |||
| Migrants | 6 | Women | 11 | ||
| Travelers | 3 | LGBTQ | 1 |
| Age (25) | Adolescents | 6 | Social status (32) | Poor | 9 |
| Young adults | 6 | Racial/ethnic minority | 9 | ||
| Elderly | 6 | Social disparity | 5 | ||
| Children | 5 | Homeless | 5 | ||
| Infants | 2 | Slave labor | 1 | ||
| Occupation (24) | Healthcare workers | 12 | Food insecure | 1 | |
| Sex workers | 6 | Disabled | 1 | ||
| Military personnel | 2 | Orphans | 1 | ||
| Female humanitarian workers | 1 | Mental health (23) | Injection drug users (IDU) | 14 | |
| Micro-farmers | 1 | Drug users | 5 | ||
| Nannies | 1 | Mental health | 3 | ||
| Unemployed | 1 | Developmental disabilities | 1 | ||
| Living conditions (11) | Rural settlements | 4 | Physical health (20) | Pre-existing conditions | 6 |
| Immunocompromised | 4 | ||||
| Nursing home residents | 3 | Unvaccinated | 3 | ||
| Informal settlement residents | 1 | Comorbidity | 2 | ||
| Remote/offshore operations | 1 | Pregnant women | 2 | ||
| University residences | 1 | Dialysis patients | 1 | ||
| Homebound patients | 1 | TB patients | 1 | ||
| People on the move (21) | Refugees/IDPs* | 12 | Critically ill | 1 | |
| Gender/Sexual orientation (25) | Homosexual men | 13 | |||
| Migrants | 6 | Women | 11 | ||
| Travelers | 3 | LGBTQ | 1 |
Note(s): *IDP = internally displaced people