According to data from the Health Protection and Surveillance Centre (HPSC), Cavan's rate increased by almost 14 per cent in 24 hours to give the county a rate of 385.9 on October 11th.
All border counties in the Republic now have an incidence rate over 100, while Cavan, Monaghan and Donegal each have rates in excess of 300 per 100,000.
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Away from the border region, Clare has the next highest 14-day incidence rate with 266. According to data from the Government's Covid-19 Data Hub, two of the county's five local electoral areas (LEAs) have incidence rates of over 200.
Only six counties now have incidence rates under 100, with Mayo, Wicklow, Tipperary, Kilkenny, Carlow and Waterford noting a slower progression of the virus.
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Last week, 4,510 additional cases of the virus were recorded in the Republic, with 17 additional deaths. In the North, increasing rate of the virus continues to be a major concern, recording 6,161 positive cases last week.
As a result of the rapid spike in cases, the Stormont Executive is due to hold an emergency meeting to discuss potential restrictions.
One of the North's priorities is the availability of beds in Intensive Care Units (ICUs), with all but 17 of the North's 98 ICU beds occupied according to the latest data from the Northern Irish Department of Health.
In the Republic, the HSE confirmed that there are 240 patients with Covid-19 in hospital as of 11am this morning, a jump of 19 in the last 24 hours. Of the 240 patients, 32 are being treated in ICUs around the country.
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