system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Since Norovirus is not a food-borne illness, why does Chipotle seem to have a disproportionate number of outbreaks within the past year as compared to other chain restaurants?

I figured maybe the number of these cases that have been highlighted recently seem high as a result of skewed media coverage. But if not,  doesn't the problem lie with sick workers coming into work rather than a fundamental problem with how Chipotle serves their food?

EDIT: Also, I was mistaken by saying it was not a food borne illness. I meant that Norovirus was not the result of a bacterial food poisoning like Salmonella where the bacteria is reproducing on the food itself (like under cooking chicken or improperly stored shellfish etc).
gpt
Cilantro is the reason.

Cilantro is an essential herb for Mexican dishes but the farms do no provide proper sanitation for their workers. If you are familiar with Cezar Chavez and the California grape industry its more or less the same struggle with migrant laborers today. One big issue is they're not even providing porta-potties and hoses to wash hands so they go in the fields.

Poop on food and you get noroviruses.

Other major contributing factors may be other produce as well. But tomatoes are more easily cleaned and grows on trellises above ground, lettuce is a major food stuff across the US and more easily farmed via tractor and avocado grow on trees, not the ground.

In 2015 the FDA banned cilantro imports from Mexico from certain Mexican States because of human feces in the fields from farms linking them with outbreaks of E. Coli in the US.

Cilantro is a leafy plant that is also difficult to clean. 
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Everybody asking me about whether or not they should eat Cilantro, yes. Food from Mexico is just as safe with the same standard of quality as the US. that being said, there will always be places where those standards falter because some one wa rs to shave a few bucks off their operating costs and the result is bad. 

Mexico is not some third world hell-hole and there are places all over the world where bad food is fed to some one because somebody else got greedy. Don't immediately blame the workers, blame the people who won't give them an outhouse.