He arrived in US on the 20th, felt symptoms on 24th, went to hospital on 26th. Sent home. Went back via ambulance on 28th.
Other questions that need answering:
What pharmacy in Dallas did he fill prescription after being sent home 1st time? Who picked it up? Where else did he go?
What schools did these exposed children attend? Have they attended since US patient zero came down with symptoms? How long have these possibly sick others been symptomatic? Where all have they been?
Obviously our government is more concerned about politics and preventing panic than actually preventing the spread of this disease in US.