A million people have now downloaded the Covid tracker app, the Department of Health said tonight.

HSE chief Paul Reid confirmed the app now had one million registered users. He said on Twitter: "The app won't make you immune to the virus but it can help to reduce the risk. Let's keep it going."

The tracker app, launched yesterday, is to help identify close contacts of people who test positive for the disease.

Speaking at the launch, acting Chief Medical Officer Dr Ronan Glynn said: "This is one more example of the solidarity and collective spirit that has characterised the Irish public's response to Covid-19 to date.

"The app is an important tool to support our contact tracing systems. It has the potential to reduce the time that people are active in the community with infection, which will have a significant impact on the transmission of the disease.

"The more people who download and use this app, the more effective it will be. It is a further opportunity for us to play our part in the response to Covid-19."

Today it was announced there had been no further deaths from Covid-19 while four deaths have been de-notified, bringing the death toll here to 1,738.

There were 11 additional cases reported to the Department of Health while seven cases were de-notified. The total number of confirmed cases here is now 25,542.

Meanwhile, there are 12 confirmed cases of Covid-19 in hospitals, according to the latest figures from the Health Service Executive.

Most hospitals have no confirmed cases at this point.

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Nine of the 12 patients with confirmed Covid-19 are in critical care beds, with seven of these on ventilators.

The public hospital system has 51 adult critical care beds vacant.

In addition to this capacity, there are five paediatric CCU beds free and 17 private critical care beds available.

Overall, there are 423 general beds free in the system.

In Northern Ireland, there have been no coronavirus deaths recorded for the fifth consecutive day, meaning the official death toll remains at 554. 

There have been four new confirmed cases, taking the cumulative total to 5,765, while for the 12th successive day there are no Covid-19 patients being treated in ICU.

The World Health Organization says data to date suggests 80% of Covid-19 infections are mild or asymptomatic, 15% are severe infection, requiring oxygen and 5% are critical, requiring ventilation. 

Generally, you need to be 15 minutes or more in the vicinity of an infected person and within two metres of them, to be considered at-risk, or a close contact.

Additional reporting Vincent Kearney