The Department of Health has been notified of a further 259 new cases of Covid-19.

The number of people being treated in hospital for the virus stands at 76, of which 27 are in ICU.

The department said daily case numbers may change due to future data review, validation and update.

Meanwhile, seven in ten cases of Covid-19 over the last two weeks were the result of close contact with a confirmed case.

An interim analysis by the Health Protection Surveillance Centre of data from between 25 May and 7 June shows there was 5,618 cases during the period.

The HPSC said 70.1% were connected to close contacts with known confirmed cases, with just over a fifth due to community transmission, which means the source of the infection is unclear.

It said 3.3% of the cases over the two weeks related to travel, while 6.1% remain under investigation.

The HPSC report shows that Limerick had the highest 14-day incidence rate per 100,000 people at 449, compared to a national average of 118.

Limerick was followed by Donegal on 177.1 and Dublin with a rate of 139.5.

Due to the cyber attack on the HSE, the system for notifying Covid-19 cases, associated deaths and outbreaks of the virus has been affected.

The provisional summary of the figures from the last two weeks is based on information captured by the HSE's Covid Care Tracker and maybe subject to change.

In an indication of the impact of vaccinations, just 6.7% of the 5,618 cases were in people aged 55 and over.

The mean age of the cases was 28.

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HSE Chief Executive Paul Reid has said that 3.1 million vaccines have been administered so far under the Covid-19 vaccination programme.

In a post on social media, he said that the strong benefits were being seen in reduced sickness, hospitalisations, ICU admissions and mortality levels.

Mr Reid also said that just 7% of daily Covid-19 cases are now from people aged 55 and older.

The Chair of the High Level Task Force on Covid-19 Vaccination said 55% of the eligible adult population has now been administered at least one dose of a vaccine.

In a tweet, Professor Brian MacCraith said the figure equates to 2.1 million people.

One million of those people have also received their second jab, accounting for 26% of the eligible adult population.

In Northern Ireland, no further Covid-19 deaths were notified by Stormont's Department of Health, but another 105 confirmed cases of the virus were recorded.

This morning, there were 18 confirmed Covid-19 inpatients in hospital, with none in intensive care. Meanwhile 1,826,614 doses of coronavirus vaccines have been administered.

Additional reporting Fergal Bowers