Swindon council confirmed the news at the distribution centre, which supplies Iceland supermarkets with goods.
30 workers were declared positive on Wednesday after checks in the morning, and this rose to 51 by Thursday afternoon.
The distribution centre, on Penzance Drive on the outskirts of the town, supplies hundreds of Iceland stores around the country.
Another outbreak occurred at the same time at the XPO Logistics centre in Swindown, the council confirmed.
21 employees tested positive here with two being hospitalized the council confirmed.
The majority of XPO staff who have tested positive for Covid-19 are believed to have contracted the virus in a “social context” through people they live together with.
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