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Unlike previous infectious disease epidemics, the outbreak
of HIV occurred essentially at the same time all over the world. In
retrospect, some reasons for this simultaneous event have been
attributed to increased international travel, international sales
of unknown contaminated blood products, and the growing incidence
of injecting drug use.
On the African continent, where HIV has become endemic, the spread
of the disease has been explained to be due to the mass movement
and increased interaction of people over the last 30 years.
Displacement or flight of people from war, tribal conflict and
civil unrest combined with increased movement for economic
development reasons (urbanisation, expansion of transportation
infrastructure and deforestation) appear to be the reasons that HIV
became embedded in the general population.
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