McDonald's (MCD) pulled its Quarter Pounder off menus in select states in connection to an E. coli outbreak that could be linked to its slivered onions and beef patties.

In response, several fast food restaurant chains have removed onions from their menus to prevent potential contamination. Yum! Brands (YUM), the parent company of Taco Bell and KFC, along with Restaurant Brands International (QSR), which owns Burger King, are removing onions from select locations "out of an abundance of caution."

Catalysts co-hosts Seana Smith and Madison Mills break down the details.

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This post was written by Angel Smith