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Sep 13, 2024 · 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.
Pathogens are infectious micro-organisms, germs, or biological agents that cause infectious diseases or illnesses in the host human. The ability of a pathogen to cause disease is called pathogenicity. The degree to which an organism is pathogenic is called virulence.
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.
- Charles A Janeway, Paul Travers, Mark Walport, Mark J Shlomchik
- 2001
- 2001
Aug 21, 2020 · Bacteria, viruses, and fungi are all types of pathogens. A pathogen brings disease to its host. Another name for a pathogen is an infectious agent, as they cause infections. As with any...
Jul 22, 2022 · Compare different types of infectious diseases, including iatrogenic, nosocomial, and zoonotic diseases; Identify and describe the stages of an acute infectious disease in terms of number of pathogens present and severity of signs and symptoms
Infectious diseases are illnesses caused by harmful organisms (pathogens) that get into your body from the outside. Pathogens that cause infectious diseases are viruses, bacteria, fungi, parasites and, rarely, prions.
These microorganisms include those that cause diseases, such as anthrax, brucellosis, hemorrhagic fever (Ebola virus infection and Marburg virus infection), plague, smallpox, and tularemia, and those that produce botulinum toxin.
