RT-PCR is considered more accurate po kasi it can detect the virus before you become infectious. Antigen po shows positive when you're at your peak na ng infection. So may chance na false negative kung too early to detect pa. That's why considered po na mas reliable ang RT-PCR. https://covid.gov.cz/en/situations/infection-and-general-measures/difference-between-rt-pcr-test-rapid-antigen-test-and
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