Up to 100 people may have had contact with those who had direct contact with Duncan after he showed symptoms. Health officials later monitored 50 low- and 10 high-risk contacts, the high-risk contacts being Duncan's close family members and three ambulance workers who took him to the hospital.[43] Everyone who came into contact with Duncan was being monitored daily to watch for symptoms of the virus,[44] until October 20, when health officials removed 43 out of the 48 initial contacts of Thomas Duncan from isolation.[45] On November 7, 2014, Dallas was officially declared "Ebola free" after 177 monitored people cleared the 21 day threshold without becoming ill.[46]