NPHET are now calling on the HSE to operate the facilities 24 hours a day.
Over 1,800 people received a covid jab at mass vaccination centres in the midlands yesterday.
906 vaccines were administered at Athlone IT; 569 in the Midlands Park Hotel, Portlaoise; and 400 at the centre in Tullamore Court Hotel which opened on Monday.
The final midlands centre - at the Bloomfield House Hotel in Mullingar - will open its doors tomorrow (Thursday).
People aged 58 are today being invited to register for their vaccine online.
Meanwhile, a total of 343 people attended the walk-in testing centre in Edenderry, which closed yesterday.
It was set up at Scoil Bhríde on Sunday, following an outbreak at the primary school.