nd will be implemented until June 15," Kamaljeet Rattan, head of corporate communications, told Dow Jones Newswires. Another airline executive, who didn't want to be named, said some flights to London and Tokyo have been cancelled while a few local flights have been clubbed. Since December, oil suppliers have put Air India on a cash-and-carry basis to buy jet fuel, meaning that the airline has to pay each time it refuels its aircraft. Airlines normally have a 90-day credit period to pay their fuel bills, but oil companies refused to follow that structure with Air India after it defaulted on some payments. Rattan said Air India pays INR160 million as its daily fuel expense but is unable to pay more, even as jet fuedelivered to stores in Austria by German companies. "If anything is found to be left over, it will be tested and taken off the market," Austrian Health Ministry spokesman Fabian Fusseis said. While two German tourists have tested positive for enterohaemorrhagic E.coli, also known as EHEC, no so-called homegrown cases have been reported, he added. In Germany, where the death toll rose to 11 on Monday, officials said even though they know that Spanish cucumbers tainted with EHEC have carried the bacteria, they still have not been able to determine the exact source. "We have found the so-called EHEC pathogens on cucumbers, but that does not mean that they are responsible for the whole outbreak," Andreas Hensel, president of Germany's Federal Institute for Risk Assessment, said on ZDF television. Spanish Health Minister Leire Pajin, noting that no Spanish cases have been reported, urged Germany to speed up its probe and establish proof of what has caused the outbreak. Germany's allegations "create alarm and affect the producers of a country without any evidence," she said. In Poland, officials said Monday that a woman has been hospitalized in serious condition after returning from a trip to the northern German city of Hamburg, where at least 467 cases of intestinal infection have been recorded. On Sunday, authorities said those included 91 cases of the more severe hemolytic uremic syndrome, but the officials noted on Monday that the number of new diarrhea cases was declining. HUS is a rare complication arising from infection associated with the E. coli bacterium. Czech officials said tests on 120 potentially tainted Spanish cucumbers pulled off shelves on Sunday are expected to be concluded in two days. No illnesses have been reported. In Italy, meanwhile, the country's paramilitary Carabinieri tainted food squad has been on the lookout since Saturday for any contaminated cucumbers, checking imports from Spain, the Netherlands and other European countries. So far, lab analyses have come back negative, and no cases of food poisoning have been report