Table 2.

Evaluation of the videos and posters according to semi-structured interviews with 8 people experiencing homelessness (PEH).

	Positive aspects	Negative aspects	Recommendations
1. General feedback on the posters and videos	Peer-approach is great Videos and posters were both well accepted (2) Visualized information was seen as beneficial, particularly for illiterates (3)		Use written media, such as newspapers, for distribution, as they are used as a source of information (3) Videos are more helpful because they are visually and aurally appealing (3)
2. Where did PEH see the posters?a	Homeless facility (2) Homeless shelter Outpatient clinic Restroom Railway station		Posters could be placed in - public transport - churches - public information boards
3. Design of the vaccination posters	Participants liked the posters (7), because: • statements perceived as clear and visible (4) • variety of languages used • people feel addressed/can identify (5) Positive aspects on the choice of motifs: • underprivileged people are the protagonists • individual portraits (2) • variety of motifs (2)	Motifs with PEH or urban motifs do not appeal to everyone because it can remind people of their own harsh realities (2) Excessive text Unsuited for illiterates (3)	The following aspects could be considered in the posters: • also depict drug consumers • utilize city landmarks for identification (2) • portray more women • portray disabilities more obviously • use of one language per poster is clearer • show more positive motives, for example nature
4. Use and benefits of the vaccination posters	Informative (5) Inspiration to think/speak about vaccination/COVID-19, but no influence on the decision to get vaccinated (3)	Not useful Risk of going unnoticed
5. Design of the videosb	The videos were appreciated (8) and perceived as: • concise (3) • easy to understand (5) People felt addressed (4) and could identify: • with the protagonists (2) • with the speaker (4) • with the diversity of protagonists • due to the realistic representation "It's the reality”		Suggestions to improve the videos: • voice could be livelier • to depict individuals who take drugs • to provides Turkish and Arabic translation • key messages conveyed at the beginning of the videos
6. Use and benefits of the videos	Perception of videos being an effective mean for health information distribution for those who possess a mobile phone (4) The information about the possibility of getting vaccinated even without health insurance and in case of drug use was perceived as particularly useful		Distribution of flat rates to the PEH during the pandemic (7)
7. Other information/questions that came up during the interviews	Test site refused rapid antigen testing due to lack of identification Question if the isolation ward is still in place COVID-19 vaccination was well tolerated despite drug use

The answers were structured in categories commenting on positive and negative aspects as well as recommendations. In the case of multiple mentions of a specific aspect, the number of mentions is given in brackets.

^aThree of the 8 participants had seen the posters before.

^bNone of the participants had seen the videos before the interview.