Last week it was announced that there was an E. coli outbreak in Colorado. The illnesses, and sadly one death, were directly linked to the Quarter Pounder burger at McDonald's. Since then, McDonald's has taken action and eliminated the Quarter Pounder from the menu throughout the entire state.

We now have answers regarding what was contaminated and how this outbreak happened.

What Was Containimated in Colorado

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The Quarter Pounder has officially returned to McDonald's menus in Colorado after 75 people were reportedly sick and one person lost their life. The Colorado Department of Agriculture investigated the cause and it turns out that the beef patty was not the source of the contamination.

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Many believed that the beef patties were the cause of the illnesses across Colorado. Newsweek reports that the fresh onions were the cause of many Coloradans coming in contact with E. coli.

RELATED: WHY IS THIS LEGENDARY MCDONALD'S MENU ITEM NOT SOLD IN COLORADO?

The Colorado Department of Agriculture determined that there was no E. coli was found in the beef. Here is what they said.

The CDA Microbiology Laboratory analyzed dozens of subsamples from all the lots and all samples were found to be negative for E. coli. CDA has completed all beef testing and does not anticipate receiving further samples.

Where Contaminated Onions Came From

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The contaminated onions came from Taylor's Farm. Specifically, the contaminated onions came from Taylor's Farm. This company has multiple locations, but the E. coli-contaminated onions were linked to Taylor's Farm location in Colorado Springs.

KOAA reports that Taylor's Farm has been removed as McDonald's source for onions for the rest of time and now many other restaurants and food providers are concerned regarding more contaminations with Taylor's Farm products.

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