A cyclospora outbreak tied to shredded iceberg lettuce produced by Taylor Farms and served at Taco Bell infects thousands and forces Taco Bell to remove the product, reducing visits 21% as investigators probe multiple sources.The Food and Drug Administration says the pattern of infections points to complex, possibly multiple origins, prolonging consumer caution and lowering traffic and spending at salad chains such as Chopt and Sweetgreen.Extreme heat in Arizona and higher fuel costs for refrigerated transport pushed iceberg prices nearly 20% and raised fresh lettuce costs about 33%, tightening supply and increasing costs for restaurants and grocery buyers.