SATURDAY, July 17 (HealthDay News) -- Exposure to high levels of traffic air pollution among people with heart or lung disease is associated with reduced heart rate variability (HRV), a risk factor for sudden cardiac death, finds a new study.

SUNDAY, July 18 (HealthDay News) -- Now that the Major League Baseball All-Star break has passed, the number of player injuries should slow down for the remainder of the season, new research suggests.

SUNDAY, July 18 (HealthDay News) - Effective and widespread treatment of HIV disease may also help cut the rate of new infections, researchers report.

SUNDAY, July 18 (HealthDay News) -- Starting antiretroviral treatment (ART) when an HIV patient has no symptoms can prevent the progressive immune system destruction that leads to AIDS, according to new treatment guidelines released by the International AIDS Society-USA Panel.

SUNDAY, July 18 (HealthDay News) -- Wouldn't it be nice if you could get the flu vaccine through a stick-on skin patch instead of a shot?

SUNDAY, July 18 (HealthDay News) -- Almost half of HIV-negative people who participate in clinical trials for HIV vaccines end up testing positive on routine HIV tests -- even though they're not actually infected, a new study shows.