There have been 503 cases of Covid-19 reported by the Department of Health.

The number of people with the disease being treated in hospital has fallen to 101 - down one since yesterday.

38 people are receiving treatment in intensive care units around the country, a decrease of one since yesterday.

The Department of Health, which is dealing with the fallout from a cyber attack last week, has said the numbers are subject to future data validation.

Earlier the Department of Health in Northern Ireland reported 107 new cases of Covid-19 and no further deaths.

There are 37 confirmed Covid-19 patients in hospitals, with two people on ventilators in ICU.

The average 7-day incidence rate per 100,000 for Northern Ireland is 32.6.

The area with the highest rate remains Derry & Strabane on 88.3, while the lowest remains Ards & North Down on 4.4.

Meanwhile people aged 49 are able to register for a Covid-19 vaccine after registration opened this morning.

For now, people in this group will be vaccinated with either a Pfizer or Moderna vaccine.

The Health Service Executive has clarified that not everyone with an underlying condition can register on the portal - only those in the 45 to 49 age group.

It said that people in the high-risk and very high-risk categories continue to be vaccinated through their GPs.

It said there was no change in the approach to the high-risk and very high-risk people in this category, compared to those in any other group.

The HSE said that the invitation for people aged 45 to 49 includes people in different groups, such as frontline healthcare staff, or people who are at high, or very high-risk due to underlying conditions, who have not been given an appointment by their hospital or healthcare team.

People aged 45 to 49 who do not have a PPS number can also register.

Those aged 48 will be able to register tomorrow, with registration opening Friday for those aged 47, on Saturday for 46 year olds and on Sunday for 45 year olds.

These vaccinations will be administered later this month and in June.

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The HSE said that as with registration for vaccination for all previous age groups, people have been asked to register by age, on specific days, to manage the traffic to the site and ensure an efficient service for all users.

The system does not stop people of different ages from registering.

It has asked the public to please adhere to their specific days and that registering first does not mean a person will be vaccinated first, but rather they are prioritised by age.

The last official published figures, before last week's cyber attack on the Health Service Executive, showed that over 279,000 doses had been administered to people in Group 4 - those aged 16-69 years, at very high-risk due to an underlying condition.

There had also been over 2,900 doses administered to people in Group 7 - those aged 16-59 years and at high-risk due to an underlying condition.

There are an estimated 350,000 people in the at high-risk Group 7 category, however some will have been captured for vaccination in other active vaccination groups.

Meanwhile, the HSE is continuing to examine the operational implications for the strict conditions attached to rolling-out the Johnson & Johnson (Janssen) and AstraZeneca vaccines to people aged 40-49 years.