A spokesman for NHS Dumfries and Galloway said: "We have had a confirmed case of a significant flu type illness.
"That case has been transferred and there are no other confirmed cases."
A spokeswoman for University Hospitals of Leicester NHS Trust said: "We can confirm that the patient has been transferred to Glenfield Hospital and is currently on a ECMO machine in ITU.
"The patient was flown to Glenfield Hospital as it is one of a limited number of hospitals in the UK that has this specialist piece of equipment. The patient is currently in a critical but stable condition."