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Some cases of type A influenza virus, also known as "swine flu", may be fatal.
Seven unvaccinated patients in Ukraine have died of flu since the start of the so-called epidemic season.
"There is no epidemic yet, but the number of patients has been growing," the TV news service TSN reported on January 17.
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Infectiologists say that, although four flu strains are common this season, the worst one for the population is type A influenza virus, better known as "swine flu", as fatal cases were earlier recorded.
Journalists urge all unvaccinated persons who fell ill to immediately consult their doctor and stay at home.