Health officials now say four people in the U.S. may be linked to the food poisoning outbreak in Europe.
All four were in northern Germany in May and officials are confident that they were infected with E. coli in that country. Three of them -- two women and a man -- are hospitalized with a kidney complication that has become a hallmark of the outbreak.
Officials said Friday they are also checking two possible E. coli cases in U.S. military service members in Germany.
The source of the outbreak hasn't been pinpointed but salad vegetables are suspected.
An official from the Food and Drug Administration says produce in the U.S. remains safe. The government has stepped up testing of imported food from Germany and Spain, but very little is imported from those countries.
The World Health Organization said Thursday that the E. coli bacteria responsible for a deadly outbreak that has left 18 dead and sickened hundreds in Europe is a new strain that has never been seen before.
Preliminary genetic sequencing suggests the strain is a mutant form of two different E. coli bacteria, with aggressive genes that could explain why the Europe-wide outbreak appears to be so massive and dangerous, the agency said.
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