Table 5 Engagement questions by HBM construct

Perceived susceptibility

When do you anticipate returning to your in-person location? How do you feel about returning in-person? (Discussion topic)

Are you comfortable relaxing your social distancing and quarantine behaviors? What would make you feel more comfortable returning to "normal"? (Discussion topic)

Perceived severity

How concerned are you at what you're hearing about COVID-19 variants? What are your major concerns? (Discussion topic)

Perceived benefits

What questions do you have about COVID-19 vaccine boosters? What do you want to know? (Discussion topic)

To what extent did each of the following reasons contribute to your decision to receive the COVID-19 vaccine? (Concern for personal health, health of family members, desire to help community, HCP recommendation, information from news/media, job/school requirements, pressure from family/friends) (Survey)

Perceived barriers

How difficult was it for you to schedule an appointment to receive the COVID-19 vaccine? (Discussion topic)

What obstacles do you face in finding information on the COVID-19 vaccine? (Survey)

Perceived self-efficacy

Have you scheduled or received your COVID-19 vaccination? Why or why not? (Discussion topic)

How knowledgeable do you consider yourself about the differences between the currently available vaccines? (Poll)

If you have received the vaccine, did anyone help you to find a location or schedule your appointment? If so, who? (Discussion topic)

Cues to action

What have you been hearing about the COVID-19 vaccines lately? What would you like to hear that you haven’t? (Discussion topic)

What factors could change your current decision on whether you will receive, not receive, or delay vaccination? (Live chat)

What questions do you have about COVID-19 vaccine boosters? What do you want to know? (Discussion topic)