Independent MLA Alex Easton said he is self-isolating after testing positive for Covid-19.
The North Down representative said he took ill last Wednesday, and tested positive on Thursday.
"Late on Wednesday I began feeling extremely unwell with a headache, fever and a cough. I booked a test for Thursday and received a positive result," he said.
"My priority is to keep those around me safe including the public and friends and family so I will be isolating until the following Thursday as instructed, and cancelled all my meetings, appointments and attending the NI Assembly."
Mr Easton said he has been "forced into his bed" with the virus, adding that although he has received his vaccination, the illness has been "tough to handle".
"I dread to think what it would be like having not taken the vaccination.
"Fortunately, I am starting to recover and thank those who have sent me kind wishes for a speedy recovery, they are very much appreciated," he added.
Read more:'Don't do as I did' advises MLA Peter Weir after losing toe in diabetes diagnosis
