Immunogenicity and Safety of an Inactivated COVID-19 Vaccine in Patients Aged ≥60 Years With Chronic Bronchitis and COPD

The subjects aged 60 years and above with chronic bronchitis and chronic obstructive pulmonary disease were recruited to receive three doses of inactivated COVID-19 vaccine on day 0, day 21 and day 111, respectively. Blood samples were collected before the first dose, 28 days after the second dose, before the third dose, 28 days after the third dose and 6 months after the third dose, respectively. Any local or systemic adverse events that occurred within 21/28 days after vaccination will be recorded.