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- Infectious diseases are illnesses caused by harmful agents (pathogens) that get into your body. The most common causes are viruses, bacteria, fungi and parasites.
my.clevelandclinic.org/health/diseases/17724-infectious-diseasesInfectious Disease: Types, Causes & Treatments - Cleveland Clinic
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Infectious diseases are illnesses caused by harmful agents (pathogens) that get into your body. The most common causes are viruses, bacteria, fungi and parasites. Infectious diseases usually spread from person to person, through contaminated food or water and through bug bites.
Sep 13, 2024 · Infectious disease is a process caused by an agent, often a microorganism, that impairs a person’s health. Infectious diseases typically are caused by bacteria, viruses, fungi, or parasites.
Feb 18, 2022 · Infectious diseases can be caused by: Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis. Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS. Fungi.
Infectious diseases are caused by microscopic organisms that penetrate the body’s natural barriers and multiply to create symptoms that can range from mild to deadly. Although progress has been made to eradicate or control many infectious diseases, humankind remains vulnerable to a wide array of new and resurgent organisms.
Infectious disease continues to cause high morbidity and mortality throughout the world, particularly in developing countries. It accounts for about a quarter of deaths worldwide, and in 2008 caused more than two-thirds of the estimated 8.8 million deaths in children under the age of five.
- Madeline Drexler, Institute of Medicine (US)
- 2010
Mar 4, 2021 · Pathogenesis—or “origin of disease”—is the study of the processes that give rise to physiologic dysfunction and illness. In the case of COVID-19, it is the study of virus-induced mischief—how SARS-CoV-2 interacts with various cells, tissues, and organs to cause COVID-19.
There are five major categories of infectious agents: Viruses, bacteria, fungi, protozoa, and helminths. Viruses are tiny, ranging in size from about 20 to 400 nanometers in diameter (see page 9). Billions can fit on the head of a pin.
