(HealthDay News) -- Morning sickness is an unpleasant, yet common side effect of pregnancy. When episodes of nausea and vomiting become severe, it's time to call the doctor.

(HealthDay News) -- The Zostavax vaccine helps protect against shingles, a painful infection caused by herpes zoster, the same virus that causes chickenpox.

WEDNESDAY, Oct. 5 (HealthDay News) -- The death toll from an outbreak of listeria first linked to tainted cantaloupes has risen to 18, and a total of 100 people have been sickened across 20 states, the U.S. Centers for Disease Control and Prevention reported late Tuesday.

TUESDAY, Oct. 4 (HealthDay News) -- New research shows that the few men who develop breast cancer tend to have more advanced cases than women and to be diagnosed at an older age.

WEDNESDAY, Oct. 5 (HealthDay News) -- Many people with pacemakers and implanted defibrillators can safely undergo MRIs to screen for cancer and other diseases, as long as certain procedures are followed, a new study finds.

WEDNESDAY, Oct. 5 (HealthDay News) -- Scientists who taught monkeys to use their brains to move the virtual hands of an avatar (a virtual body) and to identify the texture of virtual objects say the experiment demonstrates the potential benefits of this technology for people who've suffered crippling spinal injuries.

WEDNESDAY, Oct. 5 (HealthDay News) -- Women whose mothers were given the drug diethylstilbestrol (DES) during pregnancy are at increased risk for fertility problems and cancer as they age, new research shows.

WEDNESDAY, Oct. 5 (HealthDay News) -- Raw sewage contains thousands of undiscovered viruses, some of which could affect human health, a new study suggests.

WEDNESDAY, Oct. 5 (HealthDay News) -- Three hours of vigorous exercise a week can reduce a man's heart attack risk by 22 percent, a new study suggests.

WEDNESDAY, Oct. 5 (HealthDay News) -- Smokers have heart attacks earlier in life than nonsmokers, and women smokers are more likely than men to suffer complications after a heart attack, according to a new study.

WEDNESDAY, Oct. 5 (HealthDay News) -- Nutritional supplements containing omega-3 fatty acids or antioxidants don't help patients with severe lung problems in the intensive care unit, a new study indicates.

WEDNESDAY, Oct. 5 (HealthDay News) -- The percentage of nursing home residents in the United States who receive a seasonal flu shot is lower than the national goal, and the rate is lower for blacks than for whites, a new study finds.

WEDNESDAY, Oct. 5 (HealthDay News) -- Scientists have genetically engineered mice whose symptoms closely mimic autism in humans.

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

WEDNESDAY, Oct. 5 (HealthDay News) -- Older adults who think they're not in tip-top health may have a greater risk of developing dementia than folks who believe they're healthy, French researchers report in Oct. 5 issue of the journal Neurology.

WEDNESDAY, Oct. 5 (HealthDay News) -- Nearly one in four Americans must now travel farther to the nearest trauma center than 10 years ago due to closures of hospital trauma centers, a new study shows.

WEDNESDAY, Oct. 5 (HealthDay News) -- Treating women with an aggressive form of early stage breast cancer using Herceptin and chemotherapy, while not turning to a third type of drug known as an anthracycline, improves survival while posing less danger to the heart, researchers report.

WEDNESDAY, Oct. 5 (HealthDay News) -- A new oral drug for relapsing forms of multiple sclerosis appears to reduce relapse rates and disability progression, according to the results of a so-called phase 3 trial.

WEDNESDAY, Oct. 5 (HealthDay News) -- A novel stem cell therapy given shortly after a kidney transplant allows some patients to cast away the medicines meant to keep their body from attacking the new organ, according to a small new study from the Stanford University School of Medicine.

WEDNESDAY, Oct. 5 (HealthDay News) -- Steve Jobs, the visionary leader of Apple Inc., which introduced the world to personal computers, then the iPod, the iPhone and the iPad, died on Wednesday following a long battle with cancer.