Celtics' Al Horford tests positive for COVID-19 days after Jaylen Brown, per report | CBS Sports Headlines Celtics' Al Horford tests positive for COVID-19 days after Jaylen Brown, per report Horford will have to quarantine for at least 10 days, per the league’s health and safety protocols ESN FeedsThis post … Continue reading Celtics' Al Horford tests positive for COVID-19 days after Jaylen Brown, per report