Infectious agents such as bacteria or viruses have certain characteristics that can influence their ability to cause infection. One of these characteristics refers to the capacity of the agent to enter a host and multiply within the host. This is referred to as _()_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_())_(_()).
Added by John H.
Step 1
** Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 80 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
the relative ability of a microbe to a establish itself in a host and cause disease is referred to as
Sri K.
Transmission of the causative agent to the target tissue of a susceptible host and the adherence of the agent to the host's cells are the initial steps in causing damage to the host. This damage can occur through the activities of toxins from the host and other mechanisms. All of the above steps must occur for the infection to persist long enough for damage to occur. 14. Proteins found in Streptococcus pyogenes, called streptolysins, can inactivate the complement component C3a, interfering with opsonization and the binding of Fc receptors to proteins and IgA antibodies. 15. A type of symbiotic relationship in which both organisms benefit from the relationship is called mutualism. 16. Factors that aid the organism in causing infection include enzymes, pili for attachment, and tissue-degrading factors. These factors contribute to the organism's virulence. 17. Certain strains of Neisseria gonorrhoeae can avoid destruction by host IgA antibodies by acquiring a capsule, destroying the C3a complement component, and rapidly turning over the pili that bind to the antibody. 18. True or False: A condition of high viral count in the bloodstream is known as viremia. 19. True or False: In a localized infection, the microbe is spreading throughout the body. 20. True or False: Diseases like chickenpox are highly communicable. Part B. Constructed responses: Pathogens damage the host through various mechanisms, including the production of toxins that can directly damage host cells or interfere with the host's immune response. They can also invade and replicate within host cells, causing damage to the cells and tissues. Additionally, pathogens can induce an inflammatory response, leading to tissue damage and the recruitment of immune cells that can inadvertently cause further damage. Exotoxins are proteins produced by certain bacteria that are released into the surrounding environment. They can cause damage to host cells and tissues by interfering with cellular processes or by inducing an immune response. There are four main types of exotoxins: cytolytic toxins, which cause cell lysis; AB toxins, which consist of two subunits and can interfere with cellular processes; superantigens, which activate a large number of immune cells and can lead to an excessive immune response; and enterotoxins, which affect the gastrointestinal tract and can cause diarrhea and vomiting. Pathogenesis of disease refers to the process by which a pathogen causes disease in a host. This process involves the initial establishment of infection, followed by the colonization and replication of the pathogen within the host. The pathogen then causes damage to host tissues through various mechanisms, leading to the development of clinical symptoms. The severity of the disease depends on the virulence of the pathogen and the host's immune response. Robert Koch's four criteria for establishing a causal relationship between a microorganism and a disease are as follows: 1. The microorganism must be present in all cases of the disease. 2. The microorganism must be isolated and grown in pure culture. 3. The pure culture of the microorganism must cause the same disease when inoculated into a susceptible host. 4. The microorganism must be re-isolated from the experimentally infected host and shown to be the same as the original microorganism.
Madhur L.
What adaptations enable pathogenic bacteria to enter the body and cause disease?
Adi S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD