This type of reponse is the adaptive response which develops over the life span and "learns" and "remembers". This makes antibodies in response to antigens.
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.
The purpose of a vaccine is to expose an otherwise naive immune system to the pathogen, so it can recognise and quickly respond to that pathogen if it encounters it again. If you've already had the disease, your body will already recognise it if it sees it again.
It varies, but most likely not.
Waffle
Firstly if your body gets infected with an unknown pathogen then it will build a memory so next the pathogen that infect the body will automatically eliminated and second how the body gets rid of the pathogen is by sending antibodies or whiteblood cells to kill the invaders
During subsequent exposures to the same pathogen, the immune system is able to respond rapidly and activity reaches higher levels. The secondary immune responses can usually prevent disease, because the pathogen is detected, attacked and destroyed before symptoms appear.
After a white blood cell destroys a pathogen, it can either die itself or continue circulating in the body to fight other pathogens. The debris from the destroyed pathogen is usually broken down and eliminated from the body through processes such as phagocytosis or excretion.
Technıcally, a pathogen ıs anythıng that trıes to attack your body, so that bacterıa ıs the flesh-eatıng pathogen.
A virus is a non-living pathogen that invades body cells to replicate and cause infection.
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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.
An animal, insect, or human whose body can sustain the growth of a pathogen is known as the pathogen's host.