Yum! Brands, owner of Taco Bell, said on Thursday that sales trends have been “steadily improving” over the last 10 days after a cyclospora outbreak linked to shredded iceberg lettuce caused a “meaningful near-term sales impact.” CEO Chris Turner noted that consumer sentiment on social media has returned to pre-outbreak levels and that customers increasingly see the issue as industry-wide rather than specific to Taco Bell. The remarks accompanied second-quarter results that beat expectations, with net revenue up 12% to $2.17 billion.

The outbreak, first tied to Taylor Farms lettuce served at Taco Bell in five states, has since expanded to nine states, according to federal data cited by The Independent. More than 1,600 of the estimated 7,000 sick people in mid-July had reported eating at Taco Bell. But the FDA cautions that the Taco Bell link does not explain all cases; the total number of cyclosporiasis cases nationwide has now reached roughly 11,500. Investigators have not yet found a positive produce sample, and the source of contamination remains unclear.

Foot traffic at Taco Bell plummeted 31% on July 17, the first Friday after the link was announced—about 16 times worse than the broader fast-food category’s 1.9% decline, according to Placer.ai. As of July 23, visits were still 21% below average. The broader salad sector also suffered: Chopt saw a 12% drop in foot traffic, and Sweetgreen’s weekly spending fell 10 percentage points year-on-year in early July, though Sweetgreen said its food had not been linked to the outbreak.

Mexican authorities have so far found no evidence of contamination at the source. Mario Puente of the National Agricultural Council told El Cronista that Mexico’s Cofepris conducted around 10 random tests on water and lettuce from the Guanajuato region, all negative. Taylor Farms closed its Guanajuato plant, but the investigation continues along the supply chain. Meanwhile, the UK Health Security Agency reported 67 cyclospora cases in returning travellers between April and July, mostly linked to Mexico, and urged precautions such as drinking bottled water and avoiding raw salad items. The FDA has yet to identify the exact point of contamination, a finding that will determine the next regulatory steps.