About Infectious Diseases
When bacteria, viruses, and other microorganisms invade the body, they can wreak havoc on health. Infectious diseases are caused by such harmful organisms and can be passed from person to person. Some are mild, with few symptoms and no long-term side effects once the immune system destroys the bacteria or virus. Some are more severe, or can be life-threatening, requiring medical treatment. These severe infections may also be long-lasting, and increase susceptibility to other illnesses and complications.