Quick Answer: What Are Infectious Agents?

How are infectious diseases classified?

The agents of infection can be divided into different groups on the basis of their size, biochemical characteristics, or manner in which they interact with the human host.

The groups of organisms that cause infectious diseases are categorized as bacteria, viruses, fungi, and parasites..

What are 5 diseases caused by bacteria?

Bacterial diseaseBacteria.Infectious disease.Cholera.Leprosy.Tuberculosis.Plague.Syphilis.Anthrax.More items…

How do you identify an infectious agent?

Microscopy may identify microorganisms. Immunofluorescence, immuno-peroxidase staining, and other immunoassays may detect specific microbial antigens. Genetic probes identify genus- or species-specific DNA or RNA sequences. Culture: Isolation of infectious agents frequently requires specialized media.

What are the 3 ways infectious diseases are spread?

Infectious diseases can spread in a variety of ways: through the air, from direct or indirect contact with another person, soiled objects, skin or mucous membrane, saliva, urine, blood and body secretions, through sexual contact, and through contaminated food and water.

Where do infectious agents come from?

Pathogens associated with HAIs are derived primarily from human sources, but contaminated objects and environmental sources are also implicated. Human sources include patients, HCP, house hold members, and visitors.

How do infectious agents enter the body?

Microorganisms capable of causing disease—pathogens—usually enter our bodies through the mouth, eyes, nose, or urogenital openings, or through wounds or bites that breach the skin barrier. Organisms can spread—or be transmitted—by several routes.

What are Infectious Diseases examples?

Infectious diseases are diseases caused by living organisms like viruses and bacteria. They can be passed from person to person through body secretions, insects or other means. Examples are SARS, influenza, the common cold, tuberculosis (TB), Hepatitis A and B.

Which infectious agent is the smallest?

What Are Viruses, Bacteria, Fungi, and Parasites? The smallest known infectious agents, prions are composed of a single protein and viroids are a simple circle of ribonucleic acid (RNA). Prions infect brain tissue and cause normal proteins to change shape leading to cell death.

What are 5 common types of infectious diseases?

Common Infectious DiseasesChickenpox.Common cold.Diphtheria.E. coli.Giardiasis.HIV/AIDS.Infectious mononucleosis.Influenza (flu)More items…

What are 5 infectious diseases?

Protect yourself and your family from preventable infectious diseasesCoronaviruses. … Diphtheria. … Ebola. … Flu (Influenza) … Hepatitis. … Hib Disease. … HIV/AIDS. … HPV (Human Papillomavirus)More items…

What do you mean by infectious agents?

Infectious agents is a term that is generally used to describe and encompass any material that can cause an infection that can lead to a disease. These types of materials are largely Bacterial but also largely comprised of Viral, Fungal, Rickettsias, Prions and Parasites.

What are infectious agents give example?

The agents that cause disease fall into five groups: viruses, bacteria, fungi, protozoa, and helminths (worms). Protozoa and worms are usually grouped together as parasites, and are the subject of the discipline of parasitology, whereas viruses, bacteria, and fungi are the subject of microbiology.