👉 The term "febriferous" is a medical condition that refers to the presence of fever. It can be caused by various factors, such as infection or inflammation in the body, and it often indicates an underlying illness or disorder. Influenza virus (flu) is one of the most common causes of febriferous symptoms, but other viruses, fungi, and bacteria can also cause similar symptoms. Symptoms may include chills, fever, headache, fatigue, sore throat, cough