The woman, who has been named as Celia Marsh, died in December 2017, after collapsing while eating a Super Veg Rainbow Wrap.
Pret a Manger claims it yogurt it was sold by CoYo, which was guaranteed to be vegan, but actually contained dairy protein.
"CoYo, the dairy-free yoghurt brand which supplies supermarkets and shops across the UK, mis-sold to Pret a guaranteed dairy-free yogurt that was found to contain dairy protein," said a statement by Pret A Manger.
"This is believed to have resulted in the tragic death of a customer from an allergic reaction in December 2017.
"As soon as Pret was made aware of this incident by Bath Council, it withdrew all affected products. Subsequent testing by Pret and two independent authorities found that the CoYo dairy-free yoghurt contained traces of dairy protein.
"Pret informed the FSA which led to a national product recall from all supermarkets and businesses supplied by CoYo. Pret terminated its relationship with CoYo UK and is in the process of taking legal action."
But Co-Yo has said the claims are 'unfounded' in a statement it posted yesterday.
The company did have to recall a batch of products in February of this year, after they were found to contain dairy. The Food Standards Agency issued a recall, which Co-Yo described as 'devastating'.
But the company maintains that Marsh's death is not linked to the contaminated batch it recalled earlier this year.
"The dairy-free product we provided to Pret in December 2017, at the time of this tragedy, is not linked to the product we recalled in February 2018," said Co-Yo's statement.
"The product recalled in 2018 was made with a contaminated raw material that was only supplied to us in January 2018.
"Pret's inability to provide us with a batch code, despite several requests, has severely limited our ability to investigate this further."
Disclaimer: The opinions expressed in this article are prepared in the author's capacity and do not necessarily reflect the views and opinions of Plant Based News itself.Reuse this content
Maria is the Editor of Plant Based News. A former magazine editor, newspaper reporter, and features writer, her work has been published by The Guardian, The Huffington Post, and various regional newspapers. She was previously the editor of Vegan Life magazine and Vegan Trade Journal. She has interviewed a huge range of people, from Prime Ministers to authors, activists, pop stars and actors, and enjoys the varied range of topics writing for PBN allows her to tackle. You can follow her on Twitter @MariaChiorando and Instagram @mariachiorando.
Since you're here...
Plant Based News is a FREE service that receives millions of views each week on Youtube, Facebook, Instagram, Twitter, our weekly newsletter and this website. This takes a lot of our personal time, money and hard work. But we do it because we KNOW it makes a difference. If those following our reporting helped by contributing, we could do even more. Please consider supporting us so we can create further awareness about animal rights, environmentalism, ethical consumerism and the plant-based lifestyle. Not a false narrative - but information that empowers people to make better choices.