COLUMBUS, Ohio -- When mature male white-crowned sparrows duel to win a mate or a nesting territory, a young bird just doesn't get much respect.
Researchers found that older male white-crowned sparrows don't put much of a fight when they hear a young male singing in their territory – probably because the older bird doesn't consider the young rival much of a threat.
But a male sparrow will act much more aggressively if it hears a bird of the same age singing in a territory it claims as its own.
Cleansing a newborn's umbilical cord with chlorhexidine can reduce an infant's risk of infection and death during the first weeks of life by as much as 20 percent, according to a study led by researchers at the Johns Hopkins Bloomberg School of Public Health.
Mapping the ancestry of sheep over the past 11,000 years has revealed that our woolly friends are stars among domestic animals, boasting vast genetic diversity and substantial prospects for continued breeding to further boost wool and food production for a rising world population.
Contrary to current convention by which infection with the organism Clostridium difficile is regarded as an infection that is acquired by contact with symptomatic patients known to be infected with C. difficile, these may account for only a minority of new cases of the infection. These findings are important as they indicate that C. difficile infection, which can be fatal especially in older people, may not be effectively controlled by current hospital infection strategies.
CHICAGO – Administration of routine infant immunizations with a vaccine for serogroup B Neisseria meningitidis, a bacterium that is a cause of serious disease such as sepsis and meningitis, was effective against meningococcal strains and produced minimal interference with the response to the routine vaccinations, according to a study in the February 8 issue of JAMA.
CHICAGO – Among postmenopausal women with hormone receptor-positive breast cancer, increasing age was associated with a higher risk of death from breast cancer, according to a study in the February 8 issue of JAMA.
CHICAGO – Although some data have suggested a possible increased risk of intussusception (when a portion of the small or large intestine slides forward into itself, like a telescope) after administration of the pentavalent rotavirus vaccine in infants, an analysis that included almost 800,000 doses administered to U.S. infants found no increased risk of this condition following vaccination, according to a study in the February 8 issue of JAMA.
CHICAGO – Short-term use of the antibiotic cefpodoxime for the treatment of women with uncomplicated cystitis (bladder infection) did not meet criteria for noninferiority for achieving clinical cure compared with ciprofloxacin, a drug in the fluoroquinolone class of antibiotics for which there have been concerns about overuse and a resulting increase in resistance rates, according to a study in the February 8 issue of JAMA.
PHILADELPHIA – The molecular pathway that carries time-of-day signals from the body's internal clock to ultimately guide daily behavior is like a black box, says Amita Sehgal, PhD, the John Herr Musser Professor of Neuroscience and Co-Director, Comprehensive Neuroscience Center, at the Perelman School of Medicine, University of Pennsylvania.
La Jolla, CA -- Reviving a theory first proposed in the late 1800s that the development of organs in the normal embryo and the development of cancers are related, scientists at the Salk Institute for Biological Studies have studied organ development in mice to unravel how breast cancers, and perhaps other cancers, develop in people. Their findings provide new ways to predict and personalize the diagnosis and treatment of cancer.
SAN FRANCISCO – Following a total joint replacement, anticoagulation (blood thinning) drugs can prevent Deep Vein Thrombosis (DVT), a blood clot deep within the extremities, or a pulmonary embolism (PE), a complication that causes a blood clot to move to the lungs. However, prolonged use of these therapies may increase the risk of hemorrhage and infection.
SAN FRANCISCO – The elevated risk of pulmonary embolism (PE) – a blood clot that travels from the leg to the lungs – following total joint replacement (TJR) surgery has been well established, yet little is known about the natural course and timing of this potentially fatal condition.
A gene that influences the inflammatory response to infection may also predict the effectiveness of drug treatment for a deadly form of tuberculosis.
An international collaboration between researchers at the University of Washington in Seattle, Duke University, Harvard University, the Oxford University Clinical Research Unit in Vietnam and Kings College London reported these findings Feb. 3 in the journal Cell.
Women who did not plan to get pregnant are much more likely to stop breastfeeding within three months of giving birth, according to a study published in the journal Current Anthropology. The research suggests that women whose pregnancies were unplanned often experience more emotional and physical discomfort with breastfeeding compared to women who planned to get pregnant.