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The agent is the cause of the disease. When studying the epidemiology of most infectious diseases, the agent is a microbe—an organism too small to be seen with the naked eye. Disease-causing microbes are bacteria, virus, fungi, and protozoa (a type of parasite).
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A disease agent, also known as a pathogen, is any biological agent or organism that has the ability to cause disease or illness in a host organism. Examples of disease agents include bacteria, viruses, fungi, parasites, and prions. Bacteria are single-celled microorganisms that can cause a variety oRead more
A disease agent, also known as a pathogen, is any biological agent or organism that has the ability to cause disease or illness in a host organism. Examples of disease agents include bacteria, viruses, fungi, parasites, and prions.
Bacteria are single-celled microorganisms that can cause a variety of diseases, such as strep throat, tuberculosis, and pneumonia. Viruses are even smaller than bacteria and can only reproduce inside living host cells, causing diseases such as influenza, measles, and HIV. Fungi, such as molds and yeasts, can cause infections such as ringworm and thrush. Parasites, including protozoa and helminths, can cause diseases such as malaria, leishmaniasis, and tapeworm infections. Prions are abnormal proteins that can cause rare, fatal brain diseases such as Creutzfeldt-Jakob disease.
Understanding the type of disease agent responsible for an illness is important for developing effective treatments and preventive measures.
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