Two major UK grocery chains have initiated precautionary recalls of black olives following detection of listeria contamination in certain batches. This food safety measure affects customers who recently purchased these products from Waitrose and Sainsbury's locations. Listeria monocytogenes poses significant health risks, particularly for vulnerable populations including pregnant women, elderly individuals, and those with compromised immune systems. Shoppers are advised to check their purchases immediately and return affected items to stores for full refunds without requiring receipts.

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