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WHO says most cases are likely swine flu and the infection rate is in line with neighboring countries such as Russia and Poland. GENEVA (AP) — The World Health Organization says tests on swine flu samples from Ukraine show no significant mutation of the virus.

WHO had sent an expert team to Ukraine last week after reports of an unusual flu outbreak.

The global body said Tuesday that preliminary genetic sequencing at laboratories in Britain and the United States showed that the virus in Ukraine was similar to that used for production of the pandemic flu vaccine.

The Ukrainian Health Ministry has registered some 1.4 million cases of flu and respiratory illness since the start of the swine flu outbreak.

WHO says most cases are likely swine flu and the infection rate is in line with neighboring countries such as Russia and Poland.