Only people with a reference number will be tested.
People are being asked not to turn up to a Coronavirus Mobile Testing Unit in the Midlands.
Paramedics are conducting exams at a field camp in Westmeath.
Only people who have called the COVID-19 hotline and have a reference number will be tested at the unit outside St. Loman's in Mullingar.
Anyone without an appointment will be turned away.
The HSE is advising anyone who has symptoms to stay away from other people, contact their GP without delay and if you do not have a GP to phone HSE Live on 1850 24 1850.