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I congratulate you on this momentous occasion and celebration! Alas, your best friend and groomsman should remain in isolation for a minimum of 5 days, counting from 6/21 the day of test positive. Also with the current Omicron virus, we have seen that many people remain positive, which also means they are capable to shedding infectious viruses for much longer than 5 days and therefore I would not want the wedding celebration to become associated with an outbreak.