( CNN ) -- An outbreak of a virulent strain of E. coli has killed 19 people in Europe and infected more than 2,000 in at least 12 countries , the World Health Organization said on Saturday . All but one of the fatalities were reported in Germany , where officials say it 's still too early to determine whether the peak of the outbreak has passed . One person in Sweden also died . In Germany , there have been 573 cases of hemolytic uremic syndrome ( HUS ) -- a form of kidney failure -- in the current European outbreak , according to WHO . That 's more cases of HUS than in any other recorded outbreak , worldwide . Twelve patients in Germany have died of HUS , according to WHO , while six died of enterohemorrhagic E. coli , EHEC , a strain that causes hemorrhaging in the intestines and can result in abdominal cramps and bloody diarrhea . Reports indicate that an estimated 1,428 people have that E. coli strain so far but do not have HUS , according to the World Health Organization . Infections have also been identified in Austria , Czech Republic , Denmark , France , Netherlands , Norway , Poland , Spain , Switzerland and the United Kingdom , according to the organization . The European Food Safety Alert Network initially said enterohemorrhagic E. coli was found in organic cucumbers originating from Spain , packaged in Germany and distributed to various countries . But authorities have said that the source of the contamination has not been pinpointed . The Robert Koch Institute , Germany 's federal unit responsible for disease control and prevention , has advised German consumers not to eat raw tomatoes , cucumbers and lettuce . Cucumbers , tomatoes and lettuce imported from Germany and Spain will be tested and cleared before they are sold in the United States , according to David Elder of the Food and Drug Administration , and those test results will be shared with the European Union . Germany and Spain account for a small fraction of produce that is sold in the United States in a given year . Two women and a man who traveled last month to northern Germany remain hospitalized in the United States with HUS , Chris Braden of the U.S. Centers for Disease Control and Prevention said Friday . A fourth person developed bloody diarrhea , but was not hospitalized , he added . Two U.S. service members in Germany also developed diarrhea , Braden said . `` We have no expectation that this will spread in our country , '' he added .
At least 19 people have died in Europe after an outbreak of a virulent E. coli strain . More than 2,000 people have been infected . The source of the outbreak is still not clear . Officials say it 's too early to determine whether the peak of the outbreak has passed .