Infectious diseases are caused by pathogens such as bacteria, viruses, fungi, and parasites

Infectious diseases can be transmitted to humans in a variety of ways. These include: person-to-person contact, air-, water- or food-borne pathogens, and through vectors such as mosquitoes and ticks

Signs and symptoms vary depending on the organism causing the infection, but often include fever and fatigue. Mild infections may respond to rest and home remedies, while some life-threatening infections may need hospitalization.

People should see an infectious disease specialist if they have prolonged fever, pain, redness, or swelling in the body that could indicate a serious infection.