1. Males or females at least 18 years of age (inclusive) 2. Have not received COVID-19 vaccine or received 1st dose of COVID-19 vaccine (Inactivated vaccine or AstraZeneca) within 4 weeks 3. Can understand Thai language through speaking, reading and writing 4. Able to communicate through electronic tools such as Google form or line. 5. Capable of attending all study visits according to the study schedule 6. Capable of informed consent and provision of written informed consent before any study procedures

1. Males or females at least 18 years of age (inclusive) 2. Have not received COVID-19 vaccine or received 1st dose of COVID-19 vaccine (Inactivated vaccine or AstraZeneca) within 4 weeks 3. Can understand Thai language through speaking, reading and writing 4. Able to communicate through electronic tools such as Google form or line. 5. Capable of attending all study visits according to the study schedule 6. Capable of informed consent and provision of written informed consent before any study procedures