(CNN) – Chipotle is shutting down all its stores nationwide for a few hours next month to hold staff meetings about food safety.
The meeting will occur on February 8.
Chipotle (CMG) has suffered from several outbreaks of E. coli , salmonella and norovirus that poisoned customers and caused its stock price to plunge more than a third over the last three months.
Raw Ingredients: The unprocessed story of where your food comes from
The trouble began in August when 64 customers in Minnesota were infected with Salmonella and about 100 people were struck by norovirus in southern California.
These infections were followed by an E. coli outbreak in October and November that affected 53 people in nine states.
In December, Chipotle suffered from two more outbreaks. Roughly 140 students at Boston college were infected with norovirus and a second new incidence of E. coli broke out affecting five people in three states.