Largess with clear limits: in Africa and elsewhere, Gates Foundation takes focused approach to giving.

KHAYELITSHA, South Africa — Bill and Melinda Gates came to the cramped tin shack of Nkosebaca Thingathinga one day this month to understand how the 61-year-old man had contracted tuberculosis — a major focus of research for the couple’s foundation — an astounding four times.

U.N. group sets compromise on AIDS policy. Document sets no targets, cites risks to women.

UNITED NATIONS, June 2 — Delegates to a United Nations conference on AIDS reached agreement Friday after difficult negotiations on a policy declaration that sets no targets for the number of people who should be treated and makes only indirect reference to high-risk groups such as homosexuals, prostitutes and intravenous drug users.

Food or drugs? How famine and hunger compound Africa’s AIDS crisis.

Delegates at the UN summit on Aids have been hammering out the finer details of a declaration to combat HIV/Aids.Meanwhile, 40 million people worldwide are living with the disease.In countries like Kenya, the prospect of getting anti-retroviral drugs is improving – there has been a six-fold increase in the numbers getting treatment in the past two years.

AIDS vaccine testing goes overseas. U.S. funds $120 million trial despite misgivings of some researchers.

CHONBURI, Thailand — Inside a ramshackle Buddhist temple here on the country’s southeastern coast, curious villagers gathered last fall as part of the United States’ biggest gamble yet on stopping the AIDS pandemic.