The rate of Covid-19 in Monaghan is over three times the national average.
The county's 14-day incidence rate is just under 1,500 (1,499) cases per 100,000 people.
Donegal, Cavan, and Leitrim are the next worst-affected counties.
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Cavan's 14-day incidence rate is 1,028 per 100,000.
The national rate dropped from 531 to 492 in the space of a week.