inclusion criteria: 1. subjects who have obtained written consent voluntarily to participate in this clinical trial 2. subjects whose age at the time of obtaining consent is 20 years to 65 years 3. subjects who are negative for sars-cov-2 by pcr test 4. subjects who are negative for both sars-cov-2 igm antibody and sars-cov-2 igg antibody by antibody test

inclusion criteria: 1. subjects who have obtained written consent voluntarily to participate in this clinical trial 2. subjects whose age at the time of obtaining consent is 20 years to 65 years 3. subjects who are negative for sars-cov-2 by pcr test 4. subjects who are negative for both sars-cov-2 igm antibody and sars-cov-2 igg antibody by antibody test

inclusion criteria: subjects who have obtained written consent voluntarily to participate in this clinical trial subjects whose age at the time of obtaining consent is 20 years to 65 years subjects who are negative for sars-cov-2 by pcr test subjects who are negative for both sars-cov-2 igm antibody and sars-cov-2 igg antibody by antibody test

inclusion criteria: subjects who have obtained written consent voluntarily to participate in this clinical trial subjects whose age at the time of obtaining consent is 20 years to 65 years subjects who are negative for sars-cov-2 by pcr test subjects who are negative for both sars-cov-2 igm antibody and sars-cov-2 igg antibody by antibody test

inclusion criteria: 1. subjects who have obtained written consent voluntarily to participate in this clinical trial 2. subjects whose age at the time of obtaining consent is 20 years to 65 years 3. subjects who are negative for sars-cov-2 by pcr test 4. subjects who are negative for both sars-cov-2 igm antibody and sars-cov-2 igg antibody by antibody test

inclusion criteria: 1. subjects who have obtained written consent voluntarily to participate in this clinical trial 2. subjects whose age at the time of obtaining consent is 20 years to 65 years 3. subjects who are negative for sars-cov-2 by pcr test 4. subjects who are negative for both sars-cov-2 igm antibody and sars-cov-2 igg antibody by antibody test