MINNEAPOLIS - Taking a high dose of vitamin D3 is safe for people with multiple sclerosis (MS) and may correct the body's hyperactive immune response, according to a study published in the Dece. 30, 2015, online issue of Neurology®, the medical journal of the American Academy of Neurology.

Low levels of vitamin D in the blood are tied to an increased risk of developing MS. People who have MS and low levels of vitamin D are more likely to have greater disability and more disease activity.

Recurrence of HER2-positive breast cancer after treatment may be due to a specific and possibly cancer-induced weakness in the patient's immune system -- a weakness that in principle could be corrected with a HER2-targeted vaccine -- according to a new study from the Perelman School of Medicine at the University of Pennsylvania.

While hospitals have made strides in reducing the time it takes to treat heart attack patients once they arrive at the hospital, patient delays recognizing symptoms and seeking treatment are associated with increased damage to the heart, according to a study published online today in JACC: Cardiovascular Interventions.

Nearly 25 percent of all teens reported being involved in a physical fight in the past year, with higher rates of violent altercations among African-American and Latin-American adolescents than European-American ones.

To find out why, scholars writing in the Journal of Child and Family Studies conducted focus groups with African American and Latino parents regarding teen violence. Result: addressing the parents' attitudes about fighting, involving them in violence prevention programs and tailoring programs to different racial/ethnic groups may improve the effectiveness of prevention programs.

A majority of Americans, 54 percent, say it can be necessary for the government to sacrifice freedoms to fight terrorism.

About 50 percent of Americans think it is acceptable to allow warrantless government analysis of Internet activities and communications--even of American citizens--in order to keep an eye out for suspicious activity, only about 30 percent are against this type of government investigation.

About 18,000 people are severely injured every year in Germany, as determined by Florian Debus and coauthors in a new study published in Deutsches Ärzteblatt International (Dtsch Arztebl Int 2015; 112: 823-9). Earlier investigations, in 2000 and 2006, estimated that more than 32,000 people sustain multiple trauma each year. The newly calculated lower number likely reflects a reduction of severe injuries caused by road traffic and occupational accidents.