Researchers have shown that circadian oscillations in the influx of immune cells into the damaged tissue play a crucial role in exacerbating the effects of an acute heart attack in the early morning hours. The extent of the inflammatory reaction triggered by an acute heart attack, and of the…

Previous research has suggested that certain contraceptive methods may increase women's susceptibility to HIV. A randomised trial of more than 7,800 African women found that a type of contraceptive injection (intramuscular depot medroxyprogesterone acetate - DMPA-IM) posed no substantially…