Staff at two midlands meat plants tested positive in May.
The meat industry has rejected criticism of its treatment of migrant workers.
Meat Industry Ireland has told an Oireachtas committee there are no active cases now in meat plants.
Staff at Dawn Meats in Kilbeggan and Rosderra Irish Meats in Edenderry returned positive tests in May.
Earlier the Migrants Rights Centre claimed a significant number of migrant employees are still concerned about their protection from Covid-19 in the factories.
But Philip Carroll from Meat Industry Ireland says the situation in relation to Covid has improved dramatically:
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