Viruses that infect bacteria are among the most abundant life forms on Earth. Indeed, our oceans, soils and potentially even our bodies would be overrun with bacteria were it not for bacteria-eating viruses, called bacteriophages, that keep the microbial balance of ecological niches in check.

Now, a new study at Washington University School of Medicine in St. Louis suggests that bacteriophages made of RNA -- a close chemical cousin of DNA -- likely play a much larger role in shaping the bacterial makeup of worldwide habitats than previously recognized.

Despite increased understanding of heart disease risk factors and the need for preventive lifestyle changes, patients suffering the most severe type of heart attack have become younger, more obese and more likely to have preventable risk factors such as smoking, high blood pressure, diabetes and chronic obstructive pulmonary disease, according to a study scheduled for presentation at the American College of Cardiology's 65th Annual Scientific Session.

The new study analyzed heart disease risk factors among more than 3,900 patients who were treated for ST-elevation myocardial infarction, or STEMI--the most severe and deadly type of heart attack--at Cleveland Clinic between 1995 and 2014.

Researchers have identified unique anatomical features in a species of blind, walking cavefish in Thailand that enable the fish to walk and climb waterfalls in a manner comparable to tetrapods, or four-footed mammals and amphibians.

The discovery of this capability, not seen in any other living fishes, also has implications for understanding how the anatomy that all species need to walk on land evolved after the transition from finned to limbed appendages in the Devonian period, which began some 420 million years ago.

This research is reported in Scientific Reports ("Tetrapod-like pelvic girdle in a walking cavefish," by Brooke E. Flammang, Daphne Soares, Julie Markiewicz and Apinun Suvarnaraksha - http://www.nature.com/articles/srep23711.) 

Boston, MA - Botswana appears to have achieved very high rates of HIV diagnosis, treatment, and viral suppression--much better than most Western nations, including the United States--according to a new study from Harvard T.H. Chan School of Public Health and colleagues in Botswana. The findings suggest that even in countries with limited resources where a large percentage of the population is infected with HIV, strong treatment programs can help make significant headway against the HIV/AIDS epidemic.

Researchers from the University of Liverpool and colleagues from Action on Sugar have assessed the sugar content of over 200 fruit drinks marketed at children and have found them to be "unacceptably high".

The research, conducted by Professor Simon Capewell from the University's Institute of Psychology, Health and Society and Action on Sugar has been published today (Thursday, 24 March) in the online journal BMJ Open.

To assess the sugar content of fruit juice drinks, 100% natural juices, and smoothies marketed specifically to children, the researchers measured the quantity of 'free' sugars in 203 standard portion sizes (200 ml) of UK branded and supermarket own label products, using the pack labelling information provided.

A diet rich in vitamin C could cut risk of cataract progression by a third, suggests a study being published online today in Ophthalmology. The research is also the first to show that diet and lifestyle may play a greater role than genetics in cataract development and severity.