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20世纪90年代以来,北京每年约有300万外来流动人口,其中有数十万人常年居住在北京。由于多数外来人口生活居住条件较差、卫生防病意识不强,免疫基础相对薄弱,流动性较强,给本市传染病的控制带来较大难度。有资料显示,在外来人口中,乙类传染病的发病已从1997年的209.05/10万上升至2001年的
Since the 1990s, Beijing has an estimated 3 million migrants each year, and hundreds of thousands of people live in Beijing year round. Due to the poor living conditions of most migrants, the weak awareness of health and disease prevention, the relatively weak immunization basis and the strong liquidity, it is more difficult for the control of infectious diseases in this Municipality. Statistics show that among the migrants, the incidence of Category B infectious diseases has risen from 209.05 / 100,000 in 1997 to