WOODBURY - The second American infected with the deadly Ebola virus touched down in Atlanta earlier today.

A plane carrying missionary Nancy Writebol landed this morning after a trip from Liberia.

Writebol is being treated at Atlanta’s Emory University Hospital where the other American with Ebola, Dr. Kent Brantly, is already receiving care.

Both Brantly and Writebol are showing signs of improvement while receiving an experimental drug never tested for safety in humans.

Meanwhile, doctors continue to perform tests on a patient at New York City's Mount Sinai Hospital. Doctors say chances are the man does not have Ebola.

However, he has been quarantined as a precaution due to his recent visit to West Africa.

The Ebola virus has sickened more than 1,600 people in West Africa, killing nearly 900 mostly in Liberia, Guinea and Sierra Leone. It's spread through direct contact with bodily fluids.

Experts say the experimental drug could lead to a vaccine or a cure if successful.