Infectious

Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They’re normally harmless or even helpful, but under certain conditions, some organisms may cause disease such as Lyme, Shingles, hepatitis C and infectious mononucleosis. Signs and symptoms vary depending on the organism causing the infection, but often include fever and fatigue. People with weakened immune systems are more likely to develop symptoms