Federal food safety officials said fresh spinach is "as safe as it was before the outbreak," even though investigators have not determined the cause of a deadly E. coli outbreak. FDA officials said yesterday that consumers should continue to avoid spinach recalled Sept. 14 by Natural Selection Foods LLC, a fresh produce processor based in San Juan Bautista, Calif. Four other companies have recalled spinach they got from Natural Selection. But officials cleared spinach grown in the Salinas Valley, after warning consumers for the past week not to eat spinach from that area.