inclusion criteria: 1. male \& female aged ≥ 18 years and ≤70 years. 2. subjects with documented proof of 1st dose of vaccination within 3 months of planned 2nd dose. (if government of india implements booster dose then subjects needs to have a documented proof of 2nd dose) 3. subjects planning to have 2nd /3rd dose of covid-19 vaccine (covishield/ covaxin). (if government of india implements booster dose then subjects planning to have a 3rd dose of vaccine will be included in this study) 4. subject willing and able to provide a written informed consent

inclusion criteria: 1. male \& female aged ≥ 18 years and ≤70 years. 2. subjects with documented proof of 1st dose of vaccination within 3 months of planned 2nd dose. (if government of india implements booster dose then subjects needs to have a documented proof of 2nd dose) 3. subjects planning to have 2nd /3rd dose of covid-19 vaccine (covishield/ covaxin). (if government of india implements booster dose then subjects planning to have a 3rd dose of vaccine will be included in this study) 4. subject willing and able to provide a written informed consent

inclusion criteria: male & female aged ≥ 18 years and ≤70 years. subjects with documented proof of 1st dose of vaccination within 3 months of planned 2nd dose. (if government of india implements booster dose then subjects needs to have a documented proof of 2nd dose) subjects planning to have 2nd /3rd dose of covid-19 vaccine (covishield/ covaxin). (if government of india implements booster dose then subjects planning to have a 3rd dose of vaccine will be included in this study) subject willing and able to provide a written informed consent

inclusion criteria: male & female aged ≥ 18 years and ≤70 years. subjects with documented proof of 1st dose of vaccination within 3 months of planned 2nd dose. (if government of india implements booster dose then subjects needs to have a documented proof of 2nd dose) subjects planning to have 2nd /3rd dose of covid-19 vaccine (covishield/ covaxin). (if government of india implements booster dose then subjects planning to have a 3rd dose of vaccine will be included in this study) subject willing and able to provide a written informed consent