The Nigerian health care system is continuously faced with a shortage of doctors known as 'brain drain' due to the fact that many highly skilled Nigerian doctors emigrate to North America and Europe. In 1995, it was estimated that 21,000 Nigerian doctors were practicing in the United States alone, which is about the same as the number of doctors working in the Nigerian public service. Retaining these expensively trained professionals has been identified as one of the goals of the government.
According to 2009 estimates, HIV prevalence is about 3.6% of the adult population in Nigeria. The 2011 UNAIDS Report indicates that Nigeria has the second highest number of new HIV infections in the world and lacks the necessary HIV-related investments to combat the disease.
by Wikipedia