(CNN) - A doctor who recently returned from Guinea has tested positive for Ebola -- the first case of the deadly virus in New York City and the fourth diagnosed in the United States.

Here is a timeline of Craig Spencer's movements since he got back from the West African nation:Spencer came back to the United States last week after treating Ebola patients in Guinea, where he worked for Doctors Without Borders.

He completed his work in Guinea on October 12 and left the country two days later via Brussels, Belgium.

He arrived at John F. Kennedy International Airport on October 17, but he exhibited no symptoms of the virus until Thursday morning, said Dr. Mary Travis Bassett, New York City's health commissioner.

The physician, who works at Columbia Presbyterian Hospital, was checking his temperature twice a day. He has not seen any patients since his return.

Did he have any symptoms?

The 33-year-old did not have any symptoms after his return, but he developed a fever, nausea, pain and fatigue Thursday morning, authorities said. He began feeling sluggish a couple of days ago, but his fever spiked to 100.3 degrees Fahrenheit (about 38 Celsius) the day his symptoms appeared.

The government should be very careful else this thing will soon return to nigeria!!

Me self they fear now,

Almost everywhere, in guinea, Liberia is ebola infested