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Africa has the most critical HIV/AIDS epidemic in the world. A 2013 report shows roughly 24.7 million people were living with HIV in Sub-Saharan Africa, about 70% of the global total. An estimated 1.5 million people in the region became newly infected.
The prevalence of HIV virus, which causes AIDS, varies from country to country. Here is the top 10 countries with highest HIV/AIDS as of January 5, 2011, according to World Health Organization (WHO).
10) Zambia – 980,000 (rate: 12.5)
With HIV prevalence rate of 17%, Zambia is facing a generalized HIV/AIDS epidemic. Zambian Government has prioritized the access of antiretroviral treatment (ART) to all Zambians in need. Despite its significant increases the national prevalence rate is high with no sign of declining.
9) Ethiopia – 980,000 (rate: 1.4)
With an estimated 15% of the country’s population living below the poverty line, HIV/AIDS is one of Ethiopia’s biggest challenge. The overall HIV prevalence rate is 1.4 percent, based on testing a sample of 5,780 men and 5,300 women age 15 to 49. The primary mode of transmission in Ethiopia is heterosexual contact.
Democratic Republic of the Congo – 1,100,000 (rate: 4.2)
Around 100,000 people die of AIDS every year in Democratic Republic of Congo. It is one of the first African nations to recognize the virus. Here the main mode of transmission (87 percent of cases) is unprotected sex.
7) Uganda – 1,200,000 (rate: 7.2)
In Uganda, AIDS has been approached as more than a health issue. In spite of appropriate steps by the government to deal with this disease, HIV infection rate in Uganda is on the rise.
6) Zimbabwe – 1,200,000 (rate: 14.9)
Around 15 percent of the population in Zimbabwe is affected by this disease. The virus is transmitted primarily through unprotected sex and from mothers to their children. Young adults and woman are hardest hit.
5) Tanzania – 1,400,000 (rate: 5.6)
Tanzania faces a matured generalized HIV epidemic. Tanzanian women are particularly affected by this disease; around 60 percent of the affected are women. Around 86,000 people die of AIDS every year in this country.
4) Mozambique – 1,400,000 (rate: 11.3)
Mozambique is facing a severe, generalized HIV/AIDS epidemic. Around 74,000 people lose their life every year due to AIDS. The primary mode of transmission is through unprotected sex.
3) Kenya – 1,500,000 (rate: 6.2)
Even though Kenya has severe, generalized HIV epidemic, the nation has experienced a notable decline in HIV prevalence in recent years. Around 80,000 people die of AIDS every year in Kenya.
2) Nigeria – 3,300,000 (rate: 3.7)
Around 220,000 people die due to AIDS every year in Nigeria. The HIV prevalence rate among adults (aged between 15 years and 49 years) was 3.1 percent. The epidemic is complex and varies widely by region.
1) South Africa – 5,600,000 (rate: 17.3)
South Africa has highest HIV population in the world. Approximately 12 percent of the population of South Africa is affected by HIV/AIDS, and around 310,000 people die due to this disease every year in this nation.
Source; http://www.naijacruz.com/2014/12/10-countries-with-highest-hivaids-in.html

I'm not surprised considering the population of Nigeria.
If we are to go in terms of ratio, we probably won't make the list.

With increasing rate of rape, HIV will surely grow faster

God help us