"WORST. SEQUEL. EVER.," tweeted Colbert. "Out of an abundance of caution for his staff, guests, and audience, he will be isolating for a few additional days," tweeted The Late Show's Twitter account tweeted. "The Late Show will not be taping new episodes until further notice." Colbert returned last Monday after testing positive on April 21, forcing him to cancel a show and recuperate during a prescheduled week off. The news comes four days after Late Show bandleader Jon Batiste tested positive for COVID.