It's a leading cause of death, but no one knows for sure how and why it happens. It's a major source of health care costs, adding days or weeks to the hospital stays and lost work time of millions of people. But no one fully understands how best to fight it.

Blood stored for 29 days or more, nearly 2 weeks less than the current standard for blood storage, is associated with a higher infection rate in patients who received transfusions with the blood.

Clot-forming blood cells, or platelets, can drop to dangerously low levels in diseases such as anemia and in patients undergoing chemotherapy. To replace these critical cells, doctors filter platelets from donated blood, but this approach can increase the risk of transmitting blood infections and cause other side effects in patients who need frequent transfusions.

Researchers at Washington University School of Medicine in St. Louis have shown that a controversial phenomenon known as antibody-dependent enhancement (ADE) of infection is suppressed by C1q, a blood-borne immune system compound.

Scientists have made significant advances towards the development of a technique that could be used to confirm whether someone is infected with variant CJD.

Researchers at Johns Hopkins may have discovered an unintended benefit in the drugs millions of Americans take to lower their cholesterol: The medications, all statins, seem to lower the risk of a potentially lethal blood infection known as sepsis in patients on kidney dialysis. The study is published in the current issue of the Journal of the American Medical Association (JAMA).