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Listeriosis outbreaks difficult to investigate, says NICD

The food-borne disease has so far killed 172 people nationally, with more than 900 confirmed cases being treated.

A view of the listeria bacteria. Picture: National Institute for Communicable Diseases.

JOHANNESBURG - The source of a listeriosis outbreak remains a mystery.

The food-borne disease has so far killed 172 people nationally, with more than 900 confirmed cases being treated.

Pregnant women, newborn babies and the elderly are the most vulnerable.

The National Institite for Communicable Diseases' Juno Thomas: "Listeriosis outbreaks are notoriusly difficult to investigate."

Fifty-nine percent of cases have been recorded in Gauteng, followed by the Western Cape with 12%.