Risk of exposure is low
Active vaccination produces antibodies against the particular organism. These antibodies kill the invading pathogen and protect the body against the disease.
Vaccination is the process of attempting to confer artificial immunity on an individual organism by exposing the immune system to antigens of the pathogen being vaccinated against. Vaccination does not provide nearly as good protection as natural, or acquired immunity.
Sometimes they will develop mild flu like symptoms and have a low grade fever. With the weakened your body will recognize the pathogen and develop antibodies against it, so your reaction would be milder then contracting the actual illness.
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With vaccination your body mounts an immune response to the pathogen. You learn what the pathogen looks like and make antibodies (gamma globulin) against it. You then get memory cells which can last a very long time and will let your body respond and fight off the pathogen the next time you are exposed. Gamma globulin is just an antibody that will circulate in your blood and and fight off the pathogens it was made against. You will not mount an immune response, and you will not get memory cells for long lasting protection.
In a vaccination you will receive a version of the pathogen (disease) that can not make you sick because it is inactive or significantly weakened. It will be introduced into your body with an injection or sometimes using oral or nasal formulations. Your immune system will then produce antibodies, which will kill or deactivate the introduced pathogen. Therefore, if an active/live pathogen would enter your body later, your immune system would be quickly able to produce more of the same type of antibodies, as they will recognizethe organism that caused the infection and know what antibodies will work on it. Boosters then might be used over the years to essentially remind the immune system how to defend your body against the pathogen.
Vaccination against hepatitis A is unnecessary if you have already had the infection.
Epilepsy is not an infectious disease, so it cannot have a vaccine. It is a physical condition, so trying to get a vaccination against it is like trying to get a vaccination against breaking your arm.
Yearly vaccination against influenza can decrease the risk of pneumonia for certain patients