Table 2.

In-depth interview of the influencers (mother, father or grandparents).

Area	Key observations
Knowledge about VPDs	•Majority did not had any idea except for polio.
Strategies to prevent VPDs	•Cleanliness •Healthy food, exercises and clean water •Proper drainage system •Immunization
List few important vaccines	•Majority polio, some talked about BCG and measles
Perceptions about vaccines as a healthcare service	•Important, prevent diseases, and makes kids healthy •Good for kid's health but no quick effect •Recommended immunization services, especially, to neighbors at least once
Major challenges with respect to vaccination services in the slum	•Don't take it seriously vs water, food, etc. •Had to wait long	•Good behavior of staff missing sometimes •Need education about benefits
Reasons for not vaccinating	•No time •Experienced adverse event (e.g. fever, pain) •Not informed	•Not important •Work or event in family •Fear
Opportunities available to improve the vaccination?	•Weekly announcement •Recall message by text or by call •One-day prior door to door visit •Incentives e.g. for travel •Immunization session at evening or weekends •Clubbing immunization services with other health services •Award for those who completes all the vaccines on time •Regular community and healthcare service provider meeting
Expectations from and service providers/healthcare system?	•Be polite •On time services •Inform and educate	•Visit at least once per week •Offer other services •Monitor session and take feedback