The officer subsequently received a positive result and everyone who attended the event has been advised to restrict their movements.
The event was a media briefing on the murder of Jo Jo Dullard, the 21-year-old who went missing in Moone in Co Kildare 25 years ago.
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There were around 15 people present at the briefing, including Jo Jo's sister Kathleen Bergin. It took place indoors in Newbridge, Co Kildare.
In a statement, gardaí said social distancing measures were put in place at the briefing. Members of the media were advised to only attend if essential and they were told to wear a face covering.
Those present at the briefing are now restricting their movements and an internal inquiry has been launched.
