Associations of Incomplete SARS-CoV-2 Vaccination among Patients with Unstable Housing in Houston

Vaccination is a safe and effective way to protect against SARS-CoV-2. Two of the three authorized SARS-CoV-2 vaccines require two doses, presenting logistical challenges. Those with unstable housing face barriers that amplify these challenges. In this study, we utilized a database maintained by Healthcare for the Homeless-Houston to determine the rates of partial vaccination among those with unstable housing in Houston (n=294). We then performed post-hoc analyses to identify predictors of partial vaccination. Our key finding was that 30% of those with unstable housing missed their second dose, a proportion far higher than the national average. Those with permanent supportive housing and those who had a Harris County Gold Card (financial assistance for health care costs) were more likely to return for dose two, while those who were younger, living on the streets, or staying in a temporary homeless shelter were more likely to miss the second dose.