HONG KONG, Jan. 16 (Xinhua) -- Research findings have shown about 15 percent of the Hong Kong population has acquired immunity to the influenza A/H1N1 without vaccination, a senior health official of the Hong Kong Special Administrative Region (HKSAR) government said Saturday.

    The findings of the researches by the University of Hong Kong will be helpful when a committee of the HKSAR government reviews vaccination policies next week, Under Secretary for Food and Health Gabriel Leung said in an interview with a local radio.

    With those who have received vaccinations included, an estimated 1.2 million people in Hong Kong had immunity to the new flu at present, Leung said.

    Hong Kong has a total population of about 7 million. Statistics released Friday by local health authorities showed close to 136, 000 people have received subsidized vaccinations against the new flu.

    The number of people getting vaccinations each day has been recently falling, but health authorities still have to remain vigilant and prepare for any possible deterioration in the future, Leung said.