I think the guidance on colds is that they're less contagious after 4 days of symptoms, and more than 24 hours after the fever is gone. For covid it was differe

I think the guidance on colds is that they're less contagious after 4 days of symptoms, and more than 24 hours after the fever is gone. For covid it was different because you could be contagious before having symptoms, and the different strains had different numbers of days and even different sets of symptoms.