Latest figures indicate two thirds of them had not been abroad in the previous two weeks.
Over 50 healthcare workers in the Midlands have been diagnosed with the virus.
More than two thirds of the 52 people with the disease had no history of foreign travel, just 4 had been abroad and a quarter have been unspecified.
In excess of 1100 cases have been identified in front-line workers across the country.
Dublin is the worst area hit with more than 680 diagnosed.
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