European food and disease prevention authorities are investigating whether an E. coli outbreak in Germany and France could be traced back to fenugreek seeds imported from Egypt either in 2009 or last year.
The European Center for Disease Prevention and Control and the European Food Safety Authority said in a joint report that "there is still much uncertainty about whether this is truly the common cause of all the infections."
The death toll in Europe's E. coli outbreak has risen by three to at least 47, according to German authorities.
Germany has reported 46 deaths, while another person who visited Germany has died in Sweden.
The World Health Organization (WHO) said it considers an outbreak in France separate.
The report said further investigation was necessary.
compiled from agency reports