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A crisis over contaminated baby formula has grown with product recall after recall in recent weeks. On Friday, Paris’ public prosecutor said it opened investigations into five companies that make the formula. Parents and investors are on edge.

The investigation concerns possibly contaminated infant nutrition products distributed by three of the world’s largest dairy groups, Nestle

, Danone

, and privately-held Lactalis, as well as smaller brands Babybio and La Marque en Moins.