Some pathogens avoid the immune system by hiding within the cells of the host, a process referred to as intracellular pathogenesis. The pathogen hides inside the host cell where it is protected from direct contact with the complement, antibodies, and immune cells.
What virulence factors contribute to evasion of the immune system?
Some bacteria produce virulence factors that promote infection by exploiting molecules naturally produced by the host. For example, most strains of Staphylococcus aureus produce the exoenzyme coagulase, which exploits the natural mechanism of blood clotting to evade the immune system.
What type of disease is bovine respiratory disease?
Bovine respiratory disease (BRD) is the most common and costly disease affecting beef cattle in the world. It is a complex, bacterial infection that causes pneumonia in calves which can be fatal.
Is bovine respiratory disease a virus?
Bovine respiratory syncytial virus (BRSV) is one of several viruses causing respiratory tract infection and disease in cattle. The BRSV infections range from inapparent and mild to severe respiratory tract disease.
What is immune evasion mechanism?
The major group of immune evasion mechanisms implies active interference with the host’s immune responses. In particular, parasites commonly interfere with the regulatory network that orchestrates the various arms of the immune defence. But parasites also interfere with basic functions of the host’s cells.
What 2 major strategies does the immune system use to fight pathogens?
ATTACKED BY THE IMMUNE SYSTEM Page 20 Immune system uses two major strategies: • Inflammatory response. Specific defenses. What is the inflammatory response? Response to an injury or infection.
What are virulent pathogens?
Ref.1) A virulent pathogen is one that causes damage to its host to an extent that is significantly greater than those caused by a non-pathogenic organism.
What is pathogen invasion?
Invasion involves the dissemination of a pathogen throughout local tissues or the body. Pathogens may produce exoenzymes or toxins, which serve as virulence factors that allow them to colonize and damage host tissues as they spread deeper into the body.
Why is it called shipping fever?
Shipping fever (transit fever) is a vague clinical term used to denote acute respiratory diseases that occur in cattle several days or weeks after shipment. The disease is characterized by a severe fibrinous bronchopneumonia, reflecting the fact that death generally occurs early or at an acute stage.
