The jalapeno salmonella recall started with something small. The peppers in your pico de gallo might be the problem. The FDA has escalated a recall of more than 500,000 soups, dips and salsas to Class I, the most serious category the agency has, after the products were traced back to jalapeño peppers linked to a multistate salmonella outbreak.

Class I is the tier the FDA reserves for situations where there is a reasonable probability that eating a product will cause serious harm or death. The agency does not hand that label out lightly, and the upgrade in mid-September turned what was already a large August recall into one of the highest-profile food safety actions of the year, according to reporting from Men's Journal.

How a pepper became a 27-state problem

The trail starts in Sinaloa, Mexico. On August 5, the FDA and the CDC announced they were investigating a multistate outbreak of Salmonella Javiana infections tied to jalapeño peppers from that region, distributed by a company called Coast Citrus Distributors. Three days later, Texas-based NatureBest Precut & Produce LLC announced a voluntary recall of products made with the implicated peppers.

The recalled list reads like a tailgate spread: NatureBest- and HEB-branded Soup Mix, Stuffed Mushrooms, Diced Jalapeño and Pico de Gallo in Mild, Medium, Hot and Mango varieties. The company said it moved after Coast Citrus notified it that the peppers could be tainted. The products had been shipped to retail partners in Texas and Louisiana between July 3 and August 5, so shoppers in those states are the most likely to have the items in their fridges.

By mid-September, the recall covered products reaching 27 states, and the FDA formally classified the NatureBest action as Class I. That classification matters for a simple reason: Class I means the agency believes real harm, including death, is a reasonable possibility, not a remote one.

This was not the only recall

NatureBest was just one company caught in the pepper chain. On August 10, a separate recall covered products from Taylor Fresh Foods sold at Hannaford, Kroger, Stop & Shop, Target, Trader Joe's, Walmart and Whole Foods, all containing jalapeños from the same supply line. The federal guidance that accompanied it was blunt: consumers, restaurants and retailers should not eat, sell or serve the recalled products or anything containing the recalled jalapeños.

Whole Foods ran its own recall of jalapeño-containing products in August, and Chipotle pulled the peppers from its stores. Taylor Fresh Foods stopped buying ingredients from the farm linked to the outbreak. The FDA has not publicly named the grower, but the investigation tied the illness strain to peppers from Sinaloa.

Pepper-linked salmonella outbreaks are rare, but they have a history. Outbreak stories tend to escalate fast; GenZNewz recently covered a measles outbreak that grew into a three-death crisis, another case where a contained illness spread beyond its starting point. In 2008, Salmonella Saintpaul in jalapeños and serranos sickened 1,442 people across 43 states, Washington, D.C., and Canada, in a case the Food Poison Journal has documented in detail. A smaller Salmonella Anatum outbreak hit imported hot peppers in 2016. Three outbreaks in three decades, all traced to peppers from Mexico.

What to do if you bought these products

Check the fridge. If you have NatureBest- or HEB-branded soup mix, stuffed mushrooms, diced jalapeño or pico de gallo purchased in Texas or Louisiana this summer, compare it against the recall details or return it to the store. NatureBest said it has stopped distributing the affected products.

Salmonella infection usually shows up as diarrhea, fever and stomach cramps within 6 hours to 6 days of exposure, according to the CDC, and most people recover within a week. It can turn serious, and sometimes fatal, for children, elderly people and anyone with a weakened immune system. If you have symptoms after eating a recalled product, see a healthcare provider.

The peppers traveled from farms in Sinaloa to stores across more than half the country before anyone flagged the problem. That gap is exactly why one contaminated ingredient can turn the jalapeno salmonella recall into a 27-state event, and why the FDA's strongest classification exists at all. The recall ends the risk. Getting the product out of the kitchen is what actually does it.