The investigation into a deadly E. coli outbreak in 19 states widened on Sunday as a second produce company was set to recall its spinach products, reports USA Today.

FDA officials on Sunday reported 109 cases so far of infection with a deadly strain of Escherichia. coli bacteria. There has been one death, of a 77-year-old Wisconsin woman.

Suspicion has centered on packaged spinach sold by Natural Selection Foods of San Juan Bautista, California. State and federal investigators will begin sampling spinach farms in California’s Salinas Valley that have been linked to the outbreak. It will take at least a week for those samples to identify the source of the outbreak.