McDonalds: What History Says About Restaurant Stocks and Food-borne Illnesses

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McDonald's (NYSE: MCD) shares took a hit after the company's popular quarter pounders were linked to an E. coli outbreak in several Western and Midwest states. The U.S. Department of Agriculture believes that the onions used in the burgers were the likely source of the contamination.

The contamination has led to around 50 people falling ill and one death thus far. McDonald's, which has a strong history of food safety, nonetheless vowed to improve its safety protocols.

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Meanwhile, the company has pulled quarter pounders from about 20% of its locations. McDonald's said it was working with suppliers to be able to bring back quarter pounders to its menu at these locations in the coming weeks.

Restaurant stocks and food-borne illnesses

While it's not a common occurrence for large publicly traded restaurants to have food-borne illness outbreaks, there are certainly a number of instances throughout the years where it has occurred. Let's look at some pertinent examples and see what it can tell us about McDonald's and its stock.

Jack in the Box: What is arguably the worst recorded incident of food-borne illness occurred at fast-food restaurant Jack in the Box in the early 1990s. Between 1992 and 1993, there were more than 700 illnesses and the death of four children linked to an E. coli contamination at the chain related to undercooked burgers.

Sales fell at the fast-food chain for four straight quarters after the company announced it was culpable for the outbreak in January of 1993, and it took three years for the company to return to profitability. Meanwhile, its stock went from around $7 at the end of 1992 to a low of $1.69 in February of 1995. The stock returned to $7 in May of 1997.

Chipotle: The biggest food-borne incident over the past decade occurred at Chipotle in 2015 when numerous customers were sickened by E. coli. Meanwhile, about a month later, more than 100 students in Boston became sick with norovirus after eating at the restaurant. The company later paid a $25 million fine to settle criminal charges related to the outbreaks.

The incidents greatly bruised the popular Mexican food chain, which saw sales plummet in the aftermath. A year after the incident, the company reported a massive 22% decline in quarterly same-store sales, and its stock was down 45%. The stock, meanwhile, would not fully recover until the middle of 2019. From there, however, the stock would go on to quadruple.