Yum Brands is set to release its second-quarter earnings on Thursday amid growing concerns over a cyclospora outbreak linked to iceberg lettuce used at certain Taco Bell locations. Since the Food and Drug Administration identified the contamination source, Taco Bell has experienced a sharp decline in customer visits, with traffic dropping by double digits according to Placer.ai data. This has negatively impacted Yum’s market value, with shares falling 5%, bringing the company’s worth to around $42 billion. The outbreak has resulted in nearly 2,000 reported illnesses and close to 100 hospitalizations, but no fatalities.

Taco Bell plays a critical role in Yum’s growth strategy, paired with KFC’s international operations as the company’s “twin growth engines.” The Mexican-inspired chain has traditionally driven strong sales growth and maintained robust customer loyalty, even during times of increased consumer price sensitivity. The firm’s recent sale of Pizza Hut places even greater emphasis on Taco Bell’s performance, as Yum narrows its focus to fewer core brands. Habit Burger & Grill, another subsidiary, remains smaller and less significant to the company's overall revenue picture.

Wall Street expectations project Yum to earn $1.58 per share on $2.2 billion in revenue for the quarter, with Taco Bell initially forecasted to report 7% same-store sales growth—before the outbreak was linked to the chain. While analysts believe the contamination will have minimal impact on this quarter’s results, they anticipate weaker performance in the third and fourth quarters due to the lingering fallout. In response, Taco Bell has removed the affected lettuce, and CEO Sean Tresvant has issued a public apology along with promotional offers to win back customer trust.

The cyclospora outbreak poses a challenge for Taco Bell, but industry experts remain cautiously optimistic about the chain’s recovery prospects. Similar past incidents at rivals like Chipotle and McDonald’s suggest that although food safety crises can cause temporary traffic declines, brands often rebound through enhanced safety measures and renewed marketing efforts. For now, Taco Bell’s strategy focuses on transparency and value pricing as it works to regain consumer confidence, even as the outbreak continues to affect case numbers, particularly in states like Michigan.