The return of schools and people to workplaces appears to be contributing to a jump in Covid-19 cases - according to NPHET.
617 new cases of the virus were recorded yesterday with the five-day moving average increasing to 415, an increase of eight percent in the past week.
Professor Philip Nolan, who chairs NPHET's modelling group, says there has been a rise in cases among 13 to 18-year-olds.
Meanwhile, 64 year-olds can register for their Covid 19 vaccine today.
They can sign up for an AstraZeneca jab from this morning, while it will open for 63-year-olds tomorrow.
The portal will be available for people aged 64 at 10 am.