negative covid test. covid-19 has not been found. rapid test on white background. sars-cov-2 ag quick antibodies test kit.

analysis analyzing antibody antigen care cassette checkup clinical corona coronavirus covid covid19 detection diagnosis diagnostic disease doctor epidemic express health igg igm illness infection isolated lab laboratory lockdown medical medicine ncov negative pandemic pcr quarantine quick rapid result sample sars sarscov sarscov2 science test travel virus