Kibera is situated about 5km outside Nairobi and is though to be the second largest slum in Africa. It's population is disputed with estimates ranging from an official figure of 170,000 up to a million or more. All of Kenya's tribal groups are represented amongst its inhabitants which has led to periodic outbursts of intra-communal violence, especially after the December 2007 elections. The Kenyan government owns all the land upon which Kibera stands, though it continues to not officially acknowledge the settlement; no basic services, clinics, running water or lavatories are publicly provided, and what services do exist are privately owned. The combination of malnutrition, poor water, and utter lack of sanitation leads to widespread disease, with cholera, typhoid, and dysentery being predominant, followed by diarrhea, worms, and other gastrointestinal problems. HIV/AIDS is widespread with approximately 15% of Kibera's adults carrying the virus. One effect of the epidemic is the presence of over 50,000 children who were orphaned due to AIDS. The Kenyan government is building alternative accommodation alongside Kibera but progress is slow, the high-rise apartments are too expensive for most Kibera residents, and in their design they arguably work against the continuation of what, in spite of its problems, Kibera exhibits in spades: community and solidarity.