Shares of Walmart Inc. dropped in early trading Thursday, after the discount-retail behemoth missed fiscal second-quarter profit expectations, but raised its full-year outlook and saw strength in sales at both its retail and Sam’s Club warehouse stores.

U.S. stocks are falling again, this time after the country’s largest retailer reported profits that came up short of Wall Street’s expectations. The S&P 500 fell 0.5% in early trading Thursday and was on track for a fifth straight modest loss since setting an all-time high last week.

Adjusted earnings per share were softer than Wall Street was projecting, coming in at 68 cents a share, compared with estimates for 73 cents. The adjusted figure excludes one-time gains on equity and other investments,

Beyranevand says it’s possible that a particular food product could become contaminated if it was raised or farmed somewhere with elevated levels of Cs-137. Either way, she believes the breaded frozen shrimp recall is “definitely a cause for concern” for the food industry-at-large.

The FDA detected Cesium-137, a radioactive isotope, in one shipment of Great Value frozen raw shrimp to Walmart. It said the affected shipment wasn’t sold.

Great Value brand frozen shrimp sold at Walmart stores in Ohio could be contaminated with Cesium-137, warns the FDA.