The Food and Drug Administration has finally put a name on the iceberg lettuce. In an updated advisory posted July 17, FDA said its traceback converged on a single supplier of the shredded iceberg served at the Taco Bell locations where people got sick: Taylor Farms de Mexico. The CDC advisory says the same. And Taylor Farms de Mexico announced it was voluntarily removing all iceberg lettuce sourced from central Mexico from the U.S. market and told FDA it would begin a recall. As of this writing that recall notice is on Taylor’s own site but has not yet been posted by FDA.

The confirmed outbreak is ugly enough on its own. FDA and CDC count 1,644 people infected with Cyclospora who reported eating at Taco Bell across five states — Indiana, Kentucky, Michigan, Ohio and West Virginia — with 94 hospitalizations and illness onsets running from May 13 to July 13. In Michigan, where investigators did the ingredient-level interviews, roughly nine in ten of the cases they questioned reported eating iceberg lettuce.

But here is the question the advisories do not answer, and the one that matters most: where else did Taylor Farms de Mexico lettuce go?

Look at the two numbers side by side. The Taco Bell outbreak accounts for about 1,644 confirmed illnesses. The national Cyclospora count right now is roughly 1,645 confirmed cases, with another 5,100-plus still under investigation — nearly 6,745 possible illnesses spread across 34 states. In other words, essentially every confirmed case in the country traces back to Taco Bell, while more than five thousand probable cases across three dozen states trace back to nothing at all — at least not yet.

Which is it? Either the country is enduring several unrelated Cyclospora outbreaks at once, which is what federal officials are suggesting, or the same contaminated iceberg found its way into channels well beyond five states’ worth of Taco Bells, and the traceback simply has not caught up.

The recall itself hints at the answer. Taylor Farms did not pull the lettuce it shipped to Taco Bell. It pulled all iceberg lettuce sourced from central Mexico, nationwide, indefinitely. You do not yank an entire region’s supply out of the national market to solve a one-customer, five-state problem. That product went somewhere. Taylor Farms is one of the largest fresh-cut produce suppliers in the country, and beyond Taco Bell its known customers include KFC, Pizza Hut, Walmart and Trader Joe’s — and KFC and Pizza Hut share a corporate parent with Taco Bell. CDC, meanwhile, says shredded lettuce sold in grocery stores or served at other restaurants is not affected. Federal officials also admit they do not yet know whether Taylor Farms sent this lettuce to other vendors. Both of those things cannot be true.

In 2013 the very same subsidiary — Taylor Farms de Mexico — was tied to a Cyclospora outbreak that sickened 535 people in 19 states, traced to salad mix served at Olive Garden and Red Lobster. Back then, too, the company responded by halting far more than the implicated product, and FDA reassured the public that grocery-store packages were not implicated. Thirteen years later the subsidiary, the parasite, the country of origin and it’s-only-this-one-channel reassurance are all the same.

The people counting the days between bathroom trips deserve a straight answer. FDA named the supplier. Now it needs to tell us where the rest of that lettuce went — and whether the thousands sickened outside those five states ate it too.