Customers and staff were struck by the winter vomiting bug.
Wahaca Co-Founders Mark Selby and Thomasina Miers announced on the brand's website that they have contacted officials at Publich Health England and Environmental Health Offices, and are now taking precautionary measures.
"We took our own precautionary measures – voluntarily closing affected restaurants, carrying out anti-viral deep cleaning at all of our restaurants, whether affected or not, and ensuring that any staff member who had reported illness remained off site until their symptoms had ceased for at least 48 hours," they said.
"The majority of our restaurants are open and we hope to reopen the 4 remaining sites, on a case by case basis, as soon as we feel we are ready to do so. We are incredibly sorry that people have been unwell. In the 9 years since we first opened Wahaca we have never had such an unprecedented incident, and we are doing everything we can to get to the bottom of how this may have happened."
Due to the incidents, Wahaca will not be continuing its Day of the Dead fiesta to focus on getting the affected restaurants back up and running. Customers who have bought tickets to the event will receive an automatic refund.
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