Texas health officials are investigating the case of a Dallas doctor accused of making an appointment to get a shot of a vaccine before a nurse could treat an Ebola patient in a Dallas hospital.

A spokeswoman for Texas Health Presbyterian Hospital System said the office had received a complaint Thursday about the alleged appointment and was “investigating the matter.”

The statement said the hospital did not know if the doctor was the one who gave the appointment.

Texas Health Presbyterian said it is “aware of the investigation” but declined to comment further.

The Dallas nurse was diagnosed with Ebola on Sept. 30 and tested negative, but has since recovered.

The hospital says she is healthy and in stable condition.