A 43-year-old man in Cork was the first diagnosed case of community transmission of Covid-19 in Ireland. The case was detailed in an article written by medics at Cork University Hospital and published on the Irish Medical Journal last month.
The man, who was a farmer, tested positive for the virus and was tested "outside the national guidance" on testing at the time.
It was later found that the particular strain in this case showed "very little difference" from the original strain from China's Hubei province.
The man presented to the hospital on 25 February; just a few days before the first case of the virus was confirmed here. He presented with a headache and was found to have pneumonia.