Taco Bell’s parent company, Yum Brands, reported robust sales and profit in the second quarter. But more recent sales took a hit after the cyclospora outbreak plunged the company’s most important brand into a food-safety crisis.

Wall Street is projecting a strong second quarter for Yum Brands, but investors' focus will be on updates related to the cyclospora outbreak tied to Taco Bell.

The outbreak has sickened thousands and lettuce supplied to Taco Bell is the only source identified by the FDA so far.