(HealthDay News) -- Pollutants in the air from vehicles, factories and machines can harm your health, especially if you're more sensitive to them.

(HealthDay News) -- Doctors frequently order bed rest during pregnancy to protect the mother's health and that of the developing baby.

WEDNESDAY, Oct. 19 (HealthDay News) -- Obese children need special attention when they undergo anesthesia, two new studies suggest.

WEDNESDAY, Oct. 19 (HealthDay News) -- An antiseizure drug called primidone (Mysoline) and a high blood pressure drug called propranolol (Inderal) are the most effective medicines to treat shaking in people with essential tremor, according to an updated treatment guideline from the American Academy of Neurology.

WEDNESDAY, Oct. 19 (HealthDay News) -- Men who get moderate amounts of exercise have better sperm motility than men who are less or more physically active, a new study finds.

WEDNESDAY, Oct. 19 (HealthDay News) -- Some of the genetic traits that give bedbugs resistance to insecticides have been pinpointed by U.S. researchers.

WEDNESDAY, Oct. 19 (HealthDay News) -- Three leading U.S. cancer groups have proposed new guidelines for cervical cancer testing for women, including when to start screening for sexually active young women, extending intervals between screenings and in some cases, supplementing the traditional Pap test with human papilloma virus (HPV) testing.

WEDNESDAY, Oct. 19 (HealthDay News) -- The rate of antidepressant use among Americans of all ages increased nearly 400 percent over the last two decades, and 11 percent of Americans aged 12 and older now take antidepressant drugs, according to a federal government report released Wednesday.

TUESDAY, Oct. 18 (HealthDay News) -- People with lots of Facebook friends tend to have areas of the brain that are larger than those of online social network users with fewer friends, British researchers say.

WEDNESDAY, Oct. 19 (HealthDay News) -- Although pregnant women who have high blood pressure face a higher risk that their baby will be born with birth defects, new research indicates that the medications typically used to treat the condition will not raise that risk any further.

WEDNESDAY, Oct. 19 (HealthDay News) -- The U.S. Department of Veterans Affairs rivals other health care systems in the quality of care it provides to mentally ill veterans, but there are huge discrepancies in the level of care offered in various facilities across the country, according to a new study.

WEDNESDAY, Oct. 19 (HealthDay News) -- Ohio doctors report they got a diagnostic surprise when an HIV patient tested positive for the bacterium that causes leprosy.

WEDNESDAY, Oct. 19 (HealthDay News) -- Three new studies provide insight into the best time to begin AIDS drug treatments in HIV-positive patients who are also infected with tuberculosis, a double whammy common in Africa. Starting the drugs earlier, even by a few weeks, could make a big difference for patients who are very sick, the research suggests.

WEDNESDAY, Oct. 19 (HealthDay News) -- The listeria outbreak traced to cantaloupes produced at a Colorado farm that has been blamed for 25 deaths so far seems to have been caused by unsanitary conditions at the farm, U.S. officials said Wednesday.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

WEDNESDAY, Oct. 19 (HealthDay News) -- Rates of four common health care-related infections declined in the United States in 2010, but more work is needed to eliminate all such types of infections, a federal government report says.

WEDNESDAY, Oct. 19 (HealthDay News) -- Parents, you may be onto something: A small new study suggests that teens' intelligence, as measured by the IQ test, may fluctuate throughout adolescence.

WEDNESDAY, Oct. 19 (HealthDay News) -- Americans who were jobless for longer than 25 weeks in the past year were three times more likely than those who were continuously employed to suffer mental health issues for the first time, a new study finds.

WEDNESDAY, Oct. 19 (HealthDay News) -- Women with breast cancer who undergo radiation after a lumpectomy have significantly fewer recurrences and, consequently, greater odds of survival than women who forgo radiation, new research says.

WEDNESDAY, Oct. 19 (HealthDay News) -- Giving premature babies even low doses of steroids after birth interferes with development of the brain's cerebellum, which is important to motor skills, learning and behavior, new research finds.

WEDNESDAY, Oct. 19 (HealthDay News) -- Women living in poor neighborhoods are more likely to be obese and have type 2 diabetes than those who move into more advantaged areas, new research suggests.