Infectious diseases are infections caused by bacteria, viruses, fungi, or parasites.
A wide range of species calls our bodies home.
Most of the time, they're harmless or even beneficial.
However, under certain conditions, some microorganisms can cause illness.
Some infectious diseases are contagious, meaning they can be passed from person to person. Several diseases can be carried by insects and other animals.
Others can be contracted by ingesting polluted food or drink, or by coming into contact with organisms in the environment.
Fever and exhaustion are common signs and symptoms, which vary depending on the organism that is causing the infection. Mild infections may be treated with rest and home treatments, while more serious infections may necessitate hospitalization.
Vaccines help prevent several infectious diseases, such as measles and chickenpox.
Handwashing frequently and thoroughly also helps to protect against the majority of infectious infections.
The signs and symptoms of each infectious disease are unique. The following are five common signs and symptoms of a variety of infectious diseases: fever, diarrhea, fatigue, coughing, and muscle aches.