The bacteria arrive on the seed, picked up months earlier in the field, often a continent away. The germination tank does the rest, turning a handful of cells into millions by the time the sprouts hit the clamshell ¹. And one lot feeds dozens of growers: a single 1999 batch produced 157 Salmonella cases across ten states ¹.

They also work into the seed coat, past any surface wash. The industrial chlorine soak cuts the load about a thousandfold but is too variable to trust, which the FDA treats as the ceiling of the current toolkit ^{2 3}.

This is a settled, thirty-year pattern: 52 sprout outbreaks from 1996 to 2020, more than 2,700 illnesses, 179 hospitalizations, and five deaths ^{4 5}. Two events show what bad looks like. Sakai, Japan in 1996 sickened 6,309 schoolchildren and killed three ⁶. Germany in 2011 caused 845 cases of kidney-shutdown syndrome, the largest cluster ever recorded, and 54 deaths, hitting healthy adult women hardest ⁷.

The point isn't that you'll get sick. Most readers won't. It's the shape of the risk. When the lot is bad, the toxin can destroy red blood cells and shut the kidneys down, and adults over sixty die at the highest rate ⁷. For a pregnant reader the pathogen is Listeria, and the asymmetry is sharper: roughly ten times the susceptibility, and one in four placental infections end in miscarriage, stillbirth, or a newborn in intensive care ⁸. The bad lot lands on the people least able to afford it.

The advice is binary. No safe-sourcing trick helps, because the contamination is on the seed itself.

Want the crunch? Anything thin and crisp does the same job on a sandwich: shaved cabbage, julienned carrot or radish, shredded lettuce, cucumber ribbons. For nutrition, any leafy green matches raw sprouts per gram. The one real outlier is broccoli sprouts and their sulforaphane, which you can get by steaming mature broccoli.

Sprouted-grain bread and microgreens are different foods, with the wet phase short or over, and don't carry the same risk.