Germans have been warned not to eat cucumbers until tests identify the source of a deadly E.coli outbreak that has killed 10 and spread across Europe, the BBC informs. With cases reported in Sweden, Denmark, the Netherlands and the UK, Germany is set to hold crisis talks later. One woman was taken to hospital in Poland on Monday and said to be in a serious condition after returning from a trip to the northern German city of Hamburg, where more than 450 cases have been reported. On Sunday, authorities in the Czech Republic and Austria took some Spanish-grown cucumbers off shop shelves amid contamination fears. Czech officials said contaminated cucumbers may also have been exported to Hungary and Luxembourg. Two Spanish greenhouses identified as sources for the outbreak have been closed and are currently under investigation to see whether the outbreak originated there or elsewhere, said an EU spokesman.