MARIETTA, Georgia: The second American aid worker who was recently diagnosed with Ebola in west Africa has arrived in the US for treatment.

The patient arrived in a specially equipped jet at Dobbins Air Reserve Base in Marietta, Georgia, late Tuesday morning. She will be taken to an isolated unit at Emory University Hospital for treatment.

Although hospital officials haven’t released the patient’s identity, the aid group she was working with has identified her as 59-year-old Nancy Writebol.

SIM says in a statement that Writebol remains in serious but stable condition.

Dr. Kent Brantly, a physician with North Carolina-based Samaritan’s Purse, arrived in Atlanta for treatment Saturday. Both contracted Ebola while treating patients in Liberia.

Ebola is spread by close contact with blood and other bodily fluids. At the clinic, Writebol’s duties included disinfecting doctors and nurses entering or leaving the Ebola treatment area. Her son, Jeremy Writebol, has said his parents have spent the past 15 years doing international humanitarian work, and he hopes the attention focused on her case “might help develop a cure and resources to help those who are suffering.”

There is no cure for the virus, which causes hemorrhagic fever that kills as many as 60 percent to 80 percent of the people it infects in Africa. Africa’s under-developed health care system and inadequate infection controls make it easier for the Ebola virus to spread and harder to treat.