The trade union will address the Oireachtas Covid committee later today.
A union representing meat factory workers claims up to 40 employees are sharing accommodation in the midlands.
SIPTU will address the Oireachtas Covid committee this morning, with representatives from Meat Industry Ireland and the Health and Safety Authority also due to attend.
The special hearing is taking place after a recent spike in cases following outbreaks in processing plants.
SIPTU's Greg Ennis says the testing of workers and inspections of factories aren't the only issues that need to be tackled: