Once upon a time US-Mexican food chain Chipotle’s stock was valued at $757.77, but that was two years ago. Now, after the chain’s latest problem of at least 60 people getting felled by norovirus, its stock has dropped to an all-time low of $356.05.

Chipotle Mexican Grill was once the golden child of Wall Street, offering customers up-market fast food, made from eco-friendly ingredients. However, during the last half of 2015 Chipotle’s restaurants were rocked by a series of health incidents across the USA involving E. coli, norovirus, and Salmonella.

The chain vowed to change its ways but it doesn’t seem to have. In Dallas, Texas, rats were filmed in the dining area of a restaurant – one even climbing a wall – and in Virginia at least 60 people became sick with norovirus, also known as the vomiting virus. Chipotle voluntarily closed the restaurant for a day of cleaning.

Health officials are investigating.