The National Institute for Communicable Diseases (NICD), in Johannesburg, South Africa, reported 107 case patients have died from Listeria monocytogenes.

The agency, which is a division of the National Health Dept., said 852 listeriosis cases were confirmed between Jan. 1, 2017 and Feb. 5,2018, but so far, the source of the outbreak is not known. “Presently no food sources that are contaminated with the outbreak strain have been found, including amongst poultry and poultry products,” the agency said in a statement.