yellow fever

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  • 분야
  • 등록일
  • 페이지/형식
  • 구매가격
  • 적립금
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소개글
yellow fever 에 대한 자료입니다.
본문내용
Yellow fever (YF) is a viral haemorrhagic fever transmitted by infected mosquitoes.
Sylvatic (or jungle) yellow fever occurs in tropical rainforests where monkeys, infected by sylvatic mosquitoes, pass the virus onto other mosquitoes that feed on them
The intermediate cycle of yellow fever transmission occurs in humid or semi-humid savannahs of Africa, and can produce small-scale epidemics in rural villages.
Urban yellow fever results in large explosive epidemics when travellers from rural areas introduce the virus into areas with high human population density.
Yellow fever can be prevented by vaccination. In order to protect people living in areas at high risk of yellow fever transmission
Yellow fever causes epidemics that can affect 20% of the population. When epidemics occur in unvaccinated populations, case-fatality rates may exceed 50%. No treatment beyond supportive care exists.
Geographical distribution
The vast majority of cases and deaths take place in sub-Saharan Africa, where yellow fever is a major public health problem occurring in epidemic patterns.
Yellow fever is endemic in ten South and Central American countries and in several Caribbean islands.
The density and habitats of Aedes aegypti have expanded both in urban and rural areas. This mosquito is once again infesting regions from which it was previously eradicated.