Abstract
Aim. Study of spread of a new influenza variant A(H1N1) in the world in 2009. Materials and meth- ods. Analysis of WHO weekly situation reports on influenza epidemic in the countries of the Northern and Southern hemisphere. Results. The first laboratory confirmed cases of A/California/07/09 (H1N1) were registered in the countries of the Northern hemisphere in 10 days, and in other continents - in 1 month after the increase of morbidity. In the countries of Northern hemisphere 2 increases of A/California/07/09 (H1N1) morbidity were present - spring and autumn, and in the autumn period an increase of population morbidity, rate of hospitalization and number of lethal outcomes was noted. Only in Canada autumn increase of morbidity was not accompanied by an increase in severe influenza cases. In the Southern hemisphere a single but longer increase of morbidity was registered during the summer period. In the South-eastern Asia 2 increases were mostly present with a higher level during the first one. Conclusion. A significant increase in morbidity in the autumn period and its decrease at the same time in the Southern hemisphere are determined by varying seasonality of influenza in the countries of Northern and Southern hemisphere. Spring increase of morbidity was of mixed etiology, and in the autumn period influenza A/ California/07/09 (H1N1) virus dominated in the etiology of diseases.
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