Biology 1001A Lecture Notes - Sub-Saharan Africa, Reverse Transcriptase, Rna Biology

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Outbreaks of infectious disease are called epidemics. When they are not con ned to one place in the world, they are called pandemics. Aids (acquired immunode ciency syndrome) is caused by the hiv virus. It has spread worldwide, so there is a world wide outbreak of this disease. Many areas are far more affected than others. Sub-saharan africa has been very heavily affected by the hiv pandemic. About 60% of the affected people live in sub-saharan africa. Radical life expectancy decrease in these countries. Despite the efforts, the number of people with hiv continues to rise. Total of 33 million people infected with hiv. Total children with hiv 370,000, concentrated in sub-saharan africa. The number of people living with hiv has increased over the last 20 years. Fast mutation rate that makes it unresponsive to vaccines. Hides and disguises itself to avoid the body"s immune system. Maybe body has no natural immunity against the virus.

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