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.
If exposed to the same pathogen for the second time in a year, the antibody levels against the organism will increase more rapidly and to a higher level than during the first exposure. This is due to the presence of memory B cells that can quickly produce antibodies upon re-exposure to the pathogen.
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.
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After your first exposure to a pathogen, you have memory T-cells that will remember the antigen of the pathogen so in the future if you would come in contact with the same pathogen your body would recognize it right away and be able to kill it much faster.
a weaker/dead form of the pathogen is introduced to allow the body to produce the correct antibodies and make a memory-B cell that stimulates a faster immune response if the same pathogen is encountered a second time, preventing a full scale infection and making you "immune" to that pathogen
Prevents the invasion of of pathogen into the body and acts as the first and second line of defence Agianst pathogens
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
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A very broad answer to a very broad question... A "pathogen" as defined by a dictionary would be, "any disease-producing agent, esp. a virus, bacterium, or other microorganism." First- a "pathogen" in drinking water will cause nothing unless someone or something drinks the water or if the "pathogen" enters the body/host by some other means... Second- even once the "pathogen" enters the body it may still cause nothing, as the quantity of the "pathogen" must be sufficient to cause the would be disease... Third- because a "pathogen" could be any one of millions of things, what disease would be caused by your hypothetical "pathogen in the drinking water" would depend entirely on what it is... You should seriously consider being more specific about your question. If you are interested in a specific pathogen and the associated disease, please try again.
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.