WASHINGTON — A California natural foods company was linked Friday to a nationwide E. coli outbreak that has killed one person and sickened nearly 100 others. Supermarkets across the country pulled spinach from shelves, and consumers tossed out the leafy green.

Food and Drug Administration officials said that they had received reports of illness in 19 states. Twenty-nine people have been hospitalized, 14 of them with kidney failure.

The outbreak was traced to Natural Selection Foods, a holding company based in San Juan Bautista, Calif., known for Earthbound Farm and other brands. The company has voluntarily recalled products containing spinach.

FDA officials stressed that the bacteria had not been isolated in products sold by Natural Selection Foods but that the link was established by patient accounts of what they had eaten before becoming ill.

An investigation was continuing.

"It is possible that the recall and the information will extend beyond Natural Selection Foods and involve other brands and other companies, at other dates," said Dr. David Acheson, the chief medical officer with the FDA's Center for Food Safety and Applied Nutrition.

Natural Selection Foods LLC said in a statement that it was cooperating with federal and state health officials to identify the source of the contamination and had stopped shipping all fresh spinach products. They are sold under many brand names, including Earthbound Farm, Dole, Green Harvest, Natural Selection Foods, Rave Spinach, Ready Pac and Trader Joe's.

State health officials received the first reports of illness on Aug. 25, and the FDA was informed on Wednesday, Acheson said.

The FDA warned people nationwide not to eat the spinach. Washing won't get rid of the tenacious bug, though thorough cooking can kill it.

"We're waiting for the all-clear. In the meantime, Popeye the Sailor Man and this family will not be eating bagged spinach," said Dr. William Schaffner, chairman of preventative medicine at Vanderbilt University. The Tennessee university's medical center was treating a 17-year-old Kentucky girl for E. coli infection. That case originally was listed as being from Tennessee, but federal health officials changed it to Kentucky.

Each year, consumers buy hundreds of millions of pounds of bagged spinach — triple-washed and packaged in cellophane bags and clamshell boxes.

"We are very, very upset about this," Natural Selection Foods spokeswoman Samantha Cabaluna said Friday night. "What we do is produce food that we want to be healthy and safe for consumers, so this is a tragedy for us."