tailieunhanh - Advances in parasitology global mapping of infectious diseases - part 10

Phù hợp của mô hình thống kê để bệnh sốt rét toàn cầu tốt hơn đáng kể hơn phù hợp với hai mô hình sinh học thay thế, cùng một bản đồ, mặc dù điều này không phải là đặc biệt đáng ngạc nhiên bởi vì bản đồ đã được sử dụng trong việc xây dựng các mô hình thống kê | 358 . ROGERS AND . RANDOLPH Section . The fit of the statistical model to the global malaria was significantly better than the fit of two alternative biological models to the same map although this is not particularly surprising because the map was used in the construction of the statistical model but not the biological one. We repeat however that the biological model has not been tested for its accuracy against any independent datasets. The model is assumed to be correct and therefore it is further assumed the map resulting from it must also be a correct picture of where malaria was distributed before human intervention. The statistically based model of global malaria distribution under present-day climate was then re-run with various climate scenarios for the future Rogers and Randolph 2000 . Even under a relatively extreme scenario of climate change the HadCM2 High scenario http sec5 CR_dic Brochure97 there was remarkably little change in the predicted global distribution of malaria in the future compared with the present day Figures 2b and c . Unsurprisingly areas predicted to be the most affected are those near the current edges of malaria s global distribution the southern United States Turkey Turkmenistan and Uzbekistan Brazil and China. They also include some highland areas for example in East Africa where malaria is predicted to appear for the first time and some presently marginal areas that become too dry in the future and from which malaria is predicted to disappear . the eastern seaboard of India . In global terms malaria is predicted to appear for the first time in areas in which about 360 million people live at the present time and to disappear from areas where about 330 million people live at present Figure 2c . The net difference 30 million people is almost certainly not significant given the uncertainties in the modelling. Zero net differences however hide the fact that almost 700 million people will be affected one

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