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Flow of participants who used the Clinitest (Siemens-Healthineers) rapid antigen test with nasal or combined oropharyngeal and nasal self-sampling, Roosendaal, the Netherlands during omicron period. Inconclusive represents a combination of tests that showed no control line, test tubes were dropped, and test result was difficult to interpret (eg, faint line). RT-PCR=reverse transcription polymerase chain reaction
