Are Some People Immune to AIDS?

ANYONE WHO THINKS THAT BEING infected with HIV amounts to an automatic death sentence should talk to Rob Anderson. The 39-year-old San Francisco artist has beaten the odds against him by living -- no, thriving -- with the virus that causes AIDS for 14 years. At 6 ft. 2 in. and 170 lbs., Anderson has only routine medical complaints: the stuffiness of an occasional head cold or the aches and pains of a flu. His good health is not the work of some miracle drug: he has never taken AZT or any other compound to fight HIV. Incredible as it sounds,...