Seems like Chipotle's "Boorito" promotion on Halloween didn't go so well for some diners.

At least 22 people in Washington state and the Portland, Oregon area have been infected with E. coli linked to six Chipotle restaurants in the Pacific Northwest. In response, 43 locations of the chain have been closed in the two states while investigators determine the source. "We immediately closed all of our restaurants in the area out of an abundance of caution, even though the vast majority of these restaurants have no reported problems," Chipotle spokesman Chris Arnold in a statement, according to CNN.

"The safety and wellbeing of our customers is always our highest priority."

Eight individuals been have been hospitalized, according to the Washington State Department of Health, and fortunately there have been no fatalities. "Anyone who thinks they may have become ill from eating at a Chipotle restaurant in the past three weeks should consult their healthcare provider," said Washington State Epidemiologist Dr. Scott Lindquist. "The elderly and very young children are more likely to become severely ill from this kind of E. coli infection."

It's been a bad stretch for Chipotle, lately. In September, the chain faced two lawsuits in Minnesota and California for separate cases of food poisoning. Almost 100 people were infected with norovirus in the California case from a Simi Valley Chipotle.