Bacterial and viral acute sinus infections typically display similar symptoms. The duration of the infection can help determine if it is viral or bacterial. Many viruses, such as the ones that cause ...

Viral exanthem (viral rash) is a skin condition that develops because of a viral infection like chickenpox, rubella, or measles. Rashes from viral infections may cause bumps or spots that itch, are ...

Some cancer cells don't die; they go quiet, like seeds lying dormant in the soil. These "sleeper cells," scattered throughout the body, can stay inactive for years. But when the body faces a ...

It can be hard to tell the difference between viral and bacterial tonsillitis from symptoms alone. However, tonsillitis caused by a viral infection may be milder than tonsillitis caused by a bacterial ...

One of the remaining mysteries of the human immune system is why a certain cell, called a B cell, which retains a memory for past infections -- ensuring we fight off diseases we have experienced ...

Human immunodeficiency virus (HIV) is a germ that causes a lifelong infection that slowly weakens the immune system. Though the infection is lifelong, medicines can keep the virus in check and help ...

Veronica Paulus is a former STAT intern supported by the Harvard University Institute of Politics. After patients go into remission, there may still be undetected cancer cells lying dormant through ...