Updated

The Food and Drug Administration says a Mexico farm linked to an outbreak of severe stomach illnesses in two states can resume operations because no food safety violations have been found there. The number of people sickened around the country has topped 600.

The FDA said Tuesday that Taylor Farms de Mexico could resume operations after investigators found conditions there "in accordance with known food safety protocols." The firm shut down voluntarily after its salad mix served at Olive Garden and Red Lobster restaurants was linked to 242 cyclospora infections in Nebraska and Iowa. Similar illnesses in 20 other states were never definitively linked to the farm.

The federal Centers for Disease Control and Prevention said it is working with Texas to try and discover the source of more than 250 cyclospora infections there.