0
Because in culture outside of the host organism microbe or virus are not subject to immune response pressure, so their own genes that are responsible for virulence become not necessary and can be lost due to lack of selective pressure. Also, composition of the culture media can be such, that some important genes that are needed to pathogen's survival in its normal host stop being necessary.
The whole thing is a lot like an atrophy of muscles when they are not used.
What else can I help you with?
What are virulence factors?
Virulence is the degree of pathogenicity within a types of parasites. The factors of virulence are the colonization of a niche in the host, immunoevasion, immunosuppression, entry and exit of cells and obtaining nutrition from the host.
In Selenite broth why subculture from the top of the broth after incubation?
Subculturing from the top of the Selenite broth after incubation is done to isolate the target pathogen, such as Salmonella or Shigella. These bacteria are known to accumulate on the surface due to their characteristic growth patterns. By subculturing from the top layer, it increases the likelihood of obtaining a pure culture for further identification and testing.
What makes some bacteria deadly and others harmless?
The virulence of bacteria depends on factors such as their ability to produce toxins, invade host tissues, and evade the host immune response. Bacteria that possess these virulence traits are often capable of causing severe infections and disease in the host, making them deadly. In contrast, bacteria lacking these virulence factors tend to be harmless and may even provide benefits to the host.
What are disease-producing microorganisms called?
They are usually just called organisms or bacteria, virus, pathogen, or parasites.
What features of bacteria make them more virulent?
For a microbe to be virulent, it must be able to establish itself into the host, avoid and escape the host defenses. Capsules- can protect the bacteria from phagocytosis M-protein and slime layers ( aid in attachment and resistance to host defenses) Fimbriae (aid in attachment) Enzymes ( leukocidins, hemolysins,coagulase, kinases,hyaluronidase, collagenase) can increase its virulence Happy studying. Krazykatinthehat
Why virulent lost by sub-culturing?
due to virulence plasmid loss during subculturing
What does not contribute to the virulence of a pathogen?
There are infinitely many things that do not contribute to the virulence of a pathogen. Elvis does not contribute to the virulence of a pathogen.
Attributes of an organism that promote pathogenicity are called?
Virulence factors
When was Virulence - album - created?
Virulence - album - was created on 2007-01-23.
What is a virulence factor for diphtheria?
The virulence factor for diphtheria is an exotoxin named diphtheria exotoxin.
Do microorganisms with smaller infectious dose have greater or lesser virulence?
small infectious dose leads to greater virulence
What are virulence factors?
Virulence is the degree of pathogenicity within a types of parasites. The factors of virulence are the colonization of a niche in the host, immunoevasion, immunosuppression, entry and exit of cells and obtaining nutrition from the host.
How is possible to contaminate subculturing?
Subculturing can be contaminated by introducing microorganisms from the surrounding environment, using non-sterile techniques, or having contaminated equipment or media. It is essential to maintain sterile conditions, work in a clean environment, and properly handle and sterilize equipment to prevent contamination during subculturing.
What are the virulence factors of Rocky Mountain spotted fever?
How does the rocky mountain spotted fever organism result in disease & what are the virulence factors?
What has the author Charles J Dorman written?
Charles J. Dorman has written: 'Genetics of bacterial virulence' -- subject(s): Bacterial genetics, Virulence (Microbiology)
What is a virulence marker?
A virulence marker is a diagnostic tool in detecting viral factors. The importance of identifying viral factors lies in opportunities for prevention and to identify modes of transmission.
A microorganism's disease-producing power is called?
virulence
