It's close to 100% ...
but there are always exceptions since people are not identical.
They work by stressing a person's immune system and the results will vary ...
but the overall effectiveness usually exceeds 99 %.
Vaccination is the most effective tool for prevention of infectious diseases.
Vaccination
Generally diseases caused by viruses like nausea, AIDS and other can not be treated by vaccination as we do not have their vaccines or if have then they are not so effective.
Yes, a puppy can still get parvo after vaccination, but the risk is significantly reduced. Vaccination is the best way to protect against parvo, but it is not 100 effective. It is important to follow the recommended vaccination schedule and practice good hygiene to minimize the risk of infection.
get a vaccination most countries have the vaccine in their child vaccination plan so they children MUST get the vaccine.Prevention is better than cure.
active immunization by vaccination
Smallpox has been eradicated - thanks to vaccination campaigns. The only truly effective "treatment" for smallpox is vaccination. Receiving a vaccination within 3 days of exposure should severely lessen or completely prevent symptoms. Other than vaccination, other treatments are mostly supportive, such as wound care.
If you actually had laboratory confirmation that you had the A-H1N1/09 influenza, then you would be as or better protected from that same virus from then on for life. The vaccination is proven in clinical trials to be approximately 90% effective in adults with healthy immune systems. One of the reasons the vaccines are is not 100% effective is that the strain of the virus that is chosen to be the one in the vaccine may not be as good a match for the exact strain you catch in the wild, since there can be slight mutations.However, the vaccination is proven safe and effective as any seasonal flu vaccines are, so if you are not sure 100% by laboratory testing that this is the flu you had, you should go ahead and get a vaccination. If you did have the same flu, there is no problem with having the vaccination too.
The flu vaccination should protect you from getting the flu. The flu vaccine is usually 70% effective.
it means that u did something wrong and u want to fix it
In cholera vaccination you are injected the dead cells of cholera. So you get antibodies to cholera. This vaccine is not very effective. The protection rate is some where 50 to 60 % only. So you can not keep faith on the vaccine for protection from cholera.
Vaccination and Immunization