Teresa Romero Ramos, 44, is the first person known to have contracted the disease outside West Africa in the current outbreak. She tested positive for the virus Oct. 6 and has since been in isolation at Carlos III hospital in Madrid.

A statement Sunday said a blood test revealed that Romero’s immune system had eliminated the virus from her body. The statement came from the Spanish government committee in charge of the nation’s response to Ebola. A second test in the coming hours is needed to absolutely confirm Romero’s recovery, said Manuel Cuenca, microbiology director at Madrid’s Carlos III healthcare complex.