A step-by-step study of diseases that jump species gives subtle clues about future epidemics.

As the virus spreads in Democratic Republic of Congo, the World Health Organization is preparing to immunize people as soon as this week.

A study of more than 450,000 people finds a certain genetic variant associated with eating more carbs is linked to a thicker waist and higher blood pressure, but less fat.  

A study finds that the vaccine’s effects wear off as a person ages, suggesting a need for booster shots.

The vaccine shows better-than-expected effectiveness against the most common and most virulent strain of influenza in children under 9 years old.

The elimination of these glia in the mouse brain ameliorated the development of Parkinsonian neuropathologies induced by the pesticide toxin paraquat.  

From analyses of surface protein evolution to tweets on social media, scientists are gathering all the data they can to accurately predict influenza dynamics.

Nearly four dozen people have died.

A rapid increase in the global incidence of the condition has researchers scrambling to understand the causes of the trend, and cope with the consequences.