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As hunters, herders and cultivators they found the high plains to their liking.
Raging hormones, peer pressure and coming to terms with a changing body image - growing up is difficult enough without the added burden of living with HIV, and keeping it hidden from friends and classmates.
"Being a teenager is very hard; you have to keep up with the changing life, do what the others do," agreed Katlego Lally*, 17, in Botswana's capital, Gaborone, who was born with HIV but only learned of her status six years ago.
"A lot of kids throw away their pills - we're finding a lot who are failing first-line treatment already." Pettitt said only three lines of drugs for treating HIV were available in Botswana, and if interrupted treatment caused resistance to these to develop during adolescence, "your long-term prognosis doesn't look good".
A whole new world The first Teen Club started in Gaborone in 2005 with just 23 teenagers, but now has over 400; that number is expected to reach over 1,000 by 2012, and five satellite clubs have launched in other parts of the country.
The history of the Tswana people is one of continual dissension and fission where disputes, sometimes over chieftain ascendancy, resulted in a section of the tribe breaking away from the main tribe, under the leadership of a dissatisfied chief's relative, and settling elsewhere.
Often the name of the man who led the splinter group was taken as the new tribe's name.
The report recommends that countries boost their tax-to-GDP ratios to at least one-quarter, including reducing tax avoidance and “enhancing capacity to collect taxes from highly paid individuals and large firms.” According to Oxfam, governments also must meet commitments to spend a fifth of their national budget on education and 15% of their budgets on health, and “make explicit plans to reduce poverty and eliminate inequality” in line with the United Nations Sustainable Development Goals, a series of 17 goals that aim to end poverty, protect the planet, and promote peace and prosperity.
Only about one-fourth live in Botswana, the country named after them.
The Tswana are closely related to the Sotho (of Lesotho and South Africa).
Clinic staff and some of the older teenagers who serve as "teen leaders" run monthly events at the clubs, providing support and sanctuary to the vast majority of members who have never disclosed their status to anyone besides their caregivers.
"When there's only one other person that knows their status, they're leading kind of double lives," said Pettitt.