Antigen
pathogen
A pathogen is a foreign body, bacteria, or virus.
Pathogen.Pathogens can be things like viruses or bacteria which have things called antigens on them. These antigens are proteins on the pathogen that let the body know that the pathogen is potentially dangerous. This induces the immune response.Hope this helps!
Antibodies are used to fight from foreign particles (pathogen generally) entering in the body of an individual.
Antigen
Once the body activated, killer T cells it recognize pathogen and destroy them. In response that will create memory B cells and T cells specific to a certain pathogen, so if it ever came back it will be killed immediately.
During the second exposure to a pathogen, the immune system can mount a quicker and more targeted response due to immunological memory. This is because the immune system has already encountered the pathogen before and has memory cells ready to recognize and respond more efficiently to the pathogen. This results in a faster and more effective clearance of the pathogen from the body.
The node will swell
Memory B cells act like an internal vaccine because once it fights the pathogen off it will recognize it. This is how they make vaccines because they inject you with a small amount of the pathogen not enough to harm you so your memory B cells recognize it.
The pathogen tries to infect the body. The defense mechanism of the body resists the entry of the pathogen. If pathogen succeeds the infection is established and the body becomes sick.
A substance that contains the antigen of a pathogen is known as a vaccine. Vaccines are designed to stimulate the immune system by introducing a harmless form or component of the pathogen, such as proteins or inactivated viruses. This exposure helps the body recognize and mount an immune response against the pathogen if encountered in the future, providing immunity.
If it can be harmful, it can be referred to as pathogen.