An infectious disease is an illness caused by harmful microorganisms such as bacteria, viruses, fungi, or parasites that enter the body, multiply, and can cause an infection
. These microorganisms can spread from person to person, through contaminated food or water, and through bug bites. Symptoms of infectious diseases vary depending on the specific disease but can include fever, diarrhea, fatigue, muscle aches, coughing, and more
. Some infectious diseases are contagious, meaning they can spread from one person to another
. Infectious diseases can be prevented through measures such as vaccination, hand hygiene, and safe food handling practices
