MOSCOW. March 14 (Interfax) - Russian Communist party leader Gennady Zyuganov has blamed the United States for the spread of avian influenza, or bird flu, in a number of European countries, including Russia. "The forms of warfare are changing. It's strange that not a single duck has yet died in America - they are all dying in Russia and European countries. This makes one seriously wonder why," Zyuganov said at a press conference at the Interfax main office on Tuesday. Zyuganov said that he has good knowledge of war gases as he dealt with them during his army service. "I...