Dead virus cells are injected causing the animal's body's immune system to build up immunity to that particular virus. When the animal comes across that same virus it already has immunity built up so the chance of 'getting' that same germ is greatly reduced. This is an over-simplified explanation but it will give you an idea of how it works.
because there are different number of species with different effects that they can cause, therefore it is harder to develop a vaccine for it
Vaccination can produce reactions ranging from a transient and minor skin irritation and allergic reaction to some components of the oral vaccine to paralysis
Any vaccine can cause side effects. For the most part these are minor (for example, a sore arm or low-grade fever) and go away within a few days. See the related link for side effects associated with each vaccine.
Antibodies
vaccine
Some of the side effects of the shingles vaccine are cold sores on the mouth, lips, face and the private parts. There is also fevers, chills, sweats,etc.
To inject a vaccine is to introduce a small amount of the vaccine, usually through a needle, into the body. This helps stimulate the immune system to produce antibodies and create a defense against the specific disease targeted by the vaccine.
Sleeping is fine after the vaccine. Some side effects are: -Sore or numb arm -Fainting -dizzyness -Nausea
produce antibodies to help kill germs
A vaccine
The simple truth is that any vaccine can cause side effects, but they are usually minor. The most common side effects from the flu vaccine are soreness, redness, pain and swelling of the injection site, fever and malaise.
Side effects of the tetanus vaccine are minor: soreness, redness, or swelling at the site of the injection that appear any time from a few hours to two days after the vaccination and disappear in a day or two.