The presidential election in Ukraine might be delayed by the epidemic of H1N1 influenza, a government official said Friday.

Igor Popov, the deputy head of the presidential secretariat, said candidates from opposition parties would not have a level playing field trying to campaign if the flu outbreak is not brought under control, Itar-Tass reported.

"The flu epidemic drastically changed the course of the presidential election campaign, and the equal possibilities of presidential candidates and voting rights of citizens were called into question," Popov said. "The ban on public events affected opposition candidates, while candidates in office could still visit sites under quarantine and meet with their voters and the media. That is discrimination."

The first-round election is now scheduled for Jan. 17, 2010, but Popov said it could be delayed until May 30.

President Viktor Yushchenko, Prime Minister Yulia Timoshenko and former Prime Minister Viktor Yanukovich, leader of the Party of Regions, are three of the leading contenders in a field of at least six candidates.