Add Yahoo as a preferred source to see more of our stories on Google. Although researchers continue to debate the exact location where the pandemic began, there is no credible evidence that anything ...

In a breakthrough for influenza research, scientists have discovered immune cells that can recognize influenza (flu) viruses even as they mutate, raising hopes for a longer-lasting vaccine and a ...

The flu is a contagious viral infection of the respiratory system that affects the nose, throat and lungs. It is caused by influenza viruses. Symptoms of mild flu infections can resemble those of the ...