How long after testing positive for covid is someone infectious?

Current data suggests that after testing positive, the infectious period is about 4-5 days, but the quarantine period initially recommended was 14 days, since a positive test may not only occur with the first day of symptomatic COVID infection.

Two days before the onset of symptoms, but usually the transmissibility decreases by day 5 to 7. An employer may require proof of a negative test.