- Thai pregnant women, vaccinated with BBIBP-CorV at Chulabhorn Hospital - Age at least 18 years old - Gestational age at 1st vaccinated at least 12 complete weeks, confirmed by ultrasonographic measurement - Willing to keep contact for information after vaccinated - No history of fever or illness within 14 days before vaccinated - Not been diagnosed of SARS-CoV-2 infected - Not been vaccinated with any other type SARS-CoV-2 vaccine

- Thai pregnant women, vaccinated with BBIBP-CorV at Chulabhorn Hospital - Age at least 18 years old - Gestational age at 1st vaccinated at least 12 complete weeks, confirmed by ultrasonographic measurement - Willing to keep contact for information after vaccinated - No history of fever or illness within 14 days before vaccinated - Not been diagnosed of SARS-CoV-2 infected - Not been vaccinated with any other type SARS-CoV-2 vaccine