Dr Narong said the 30,024 cases of H1N1 were recorded from early this year to April 25 - an increase of 36% over the same period last year - resulting in 50 deaths. There were no deaths from the H1N1 virus last year.
He said an influenza virus of this type was much stronger than those of other strains and most Thai people have little resistance to it. As a result, a larger number of people have contracted the disease.
However, the number of people getting sick with H1N1 has decreased from about 2,000 a week to 500.
Dr Narong said he has instructed all state and private hospitals nationwide to warn people to take precautionary measures and separate H1N1 patients from others.