Humans have always battled microbes. But if the assaults seem to be coming more frequently and ferociously, that's because they are ...

Scientists have identified a new way to distinguish healthy guts from diseased ones and track how some illnesses progress by measuring how gut bacteria interact with one another. According to a study ...

Viruses and bacteria are not responsible for all infections diseases. Many infectious diseases are caused by viruses and bacteria. But there are also other types of pathogens that cause illness.

Growing research suggests the bacteria left behind by the common childhood infection may trick the immune system into ...