• shapeofmyheart > PoliomyelitisUnited
  • PoliomyelitisUnited

    免费下载 下载该文档 文档格式:PPT   更新时间:2009-11-01   下载次数:0   点击次数:1
    文档基本属性
    文档语言:
    文档格式:ppt
    文档作者:Rasha Salama
    关键词:
    主题:
    备注:
    点击这里显示更多文档属性
    Epidemiology of Poliomyelitis
    Dr. Rasha Salama
    PhD Community Medicine and Public Health
    Suez Canal University
    Egypt
    Poliomyelitis
    First described by Michael Underwood in 1789
    First outbreak described in U.S.
    in 1843
    21,000 paralytic cases reported in the U. S. in 1952
    Global eradication in near future
    Introduction
    A viral infection most often recognized by acute onset of flaccid paralysis.
    Infection with poliovirus results in a spectrum of clinical manifestations from inapparent infection to non-specific febrile illness, aseptic meningitis, paralytic disease, and death.
    Poliomyelitis is a highly infectious disease caused by three serotypes of poliovirus.
    Two phases of acute poliomyelitis can be distinguished: a non-specific febrile illness (minor illness) followed, in a small proportion of patients, by aseptic meningitis and/or paralytic disease (major illness).
    The ratio of cases of inapparent infection to paralytic disease ranges from 100:1 to 1000:1.
    Outcomes of poliovirus infection
    Epidemiological pattern
    The epidemiological pattern of polio depends upon the degree of the socioeconomic development and health care services of a country.
    The pattern of the disease has been considerably modified by widespread immunization.
    According to the WHO; Three epidemiological patterns have now been delineated:
    Countries with no immunization: the virus infects all children, and by age 5 years almost all children develop antibodies to at least one of the 3 types of polio virus. In that pattern paralytic polio cases are frequent in infants.
    Countries with partial immunization: In these countries, wild polio virus is largely replaced by vaccine virus in the environment.
    Countries with almost total immunization coverage: in these countries polio is becoming rare, however, sporadic cases do occur rarely.
    Poliomyelitis—United States, 1950-2005*

    下一页

  • 下载地址 (推荐使用迅雷下载地址,速度快,支持断点续传)
  • 免费下载 PPT格式下载
  • 您可能感兴趣的
  • shapeofmyheart  shapemyheart  shapefomyheart  shapeofheart  theshapeofheart  heartshape  shape  heartshapebox  secretofmyheart  queenofmyheart