1 in 5 gay, bisexual men has AIDS virus and many don’t know it, says CDC study of 21 cities

44 pct of gay, bisexual men with HIV don’t know it

Expert says bird flu still a pandemic danger, warns against complacency after swine flu fizzle

Expert warns of complacency after swine flu fizzle

AIDS breakthrough: African study offers hope to women by helping prevent HIV, herpes

AIDS breakthrough: Gel helps prevent infection

In US cities, AIDS virus is linked more to poverty than race, study finds

In US cities, HIV linked more to poverty than race

Poor people more often infected by AIDS virus than those with more money, study finds

Study: Poverty, more than race, tied to HIV

Treating HIV helps prevent spread of the AIDS virus to others, Canadian study finds

Treating HIV also prevents its spread, study finds

Study: Fast Tamiflu treatment saved many pregnant swine flu victims in US

Flu drugs saved many pregnant swine flu victims

AP Enterprise: Cruise line, NASA got swine flu shots early on; CDC says system worked well

AP Enterprise: NASA, cruise line got flu shots

Swine flu is not as contagious as other pandemic strains except for kids, new study suggests

Swine flu not as catchy as other pandemic strains

WHO chief says too early to say if swine flu pandemic has peaked everywhere

WHO chief: swine flu pandemic continues

GENEVA — Many more people could become sick with swine flu this winter even though it has peaked in North America and some European countries, the head of the World Health Organization said Tuesday.