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The adaptive immune system is activated if the innate immune system is unable to control the infection.
your immune system and your White blood cells produce antibodies
immune system
Opportunist infection
Oh yes. Your immune system is what fights infections and with out your immune system you will get all kinds of infection and it can be fatal.
Usually a vaccine does not help one get better from an infection, instead it prevents getting the infection in the first place by preparing the immune system to fight the infectious organism before the immune system would encounter the infectious organism during an infection.There are however a few diseases (e.g. rabies) where giving a vaccine after the infection has already begun can be helpful to help one get better from that infection. This works because the level of the vaccine early in the infection can exceed the level of the infectious organism for a short period of time. This prepares the immune system to fight the infectious organism before the immune system would encounter enough of the infectious organism during that infection, giving the immune system an "advantage". But for most infections this will not work at all.
by the immune system
the immune system
Your immune system.
tissues
It can build up white blood cells to fight against the infection and if it is present again you will all ready be immune to it. That is why vaccinations have a small amount of the infection in them, so you can become immune to it later.
Vaccines do not prevent infection. Vaccines prepare the immune system to fight infection by allowing the immune system to produce antibodies to a specific invading organism, kill it, and remember it in the future. In vaccines, this organism is often weakened or dead. If the invading organism is found by the immune system in the future following immunization, the immune system remembers it and produces the specific antibodies needed to kill it quickly.