(AFA - 2011)
South Africa has the second-highest number of HIV/Aids patients in the world. Around one in seven of its citizens is infected with HIV. Free anti-retroviral drugs are available under a state-funded scheme.
http://news.bbc.co.uk/2/hi/africa/country_profiles/1071886.stm
It’s correct to say that
there are seven people infected by HIV/Aids in each different city of South Africa.
among seven inhabitants from South Africa at least one is infected by HIV/Aids.
one person per city is infected by HIV/Aids in South Africa.
almost seven people are infected by HIV/Aids in each city of South Africa.