You have to specify the pathogen.
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 mumps are caused by a virus called the paramyxovirus.
paramyxovirus
A pathogen (being something living from the goodness a body example: a tic living from a dog) 3 ways it can effect the host is: * disease of the host as the pathogen carried disease. * malnutrition of the host as the host can become weak due to the pathogen surviving from the hosts body. Example would be iron deficiency in the host, due to the pathogen using the hosts blood to live on * finally death of the host.
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
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.
paramyxovirus
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It's a virus, a type of pathogen entirely different from other pathogen groups. There are many different paramyxoviruses that affect humans directly, including measles, Hendra virus and Nipah virus, and mild ones that cause colds.
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.