Local health authorities said the factory would be closed for at least one week for major disinfection.
Around 800 people were tested at the Smithfield factory and results were available by Monday for 488 tests.
Smithfield is the largest pork producer in Romania. It had a turnover of RON1.2 billion in 2019 and a net profit of RON53 million, up 90% on the year. It has 47 farms and feed plants and a slaughtering facility in TimiscCounty, with a capacity of 1.3 million pigs/year.