VAERS is the Vaccine Adverse Effects Reporting System and is a very important part of evaluating new vaccines. In particular the new H1N1 vaccine. Many people do not report to their physician all of the adverse effects of a vaccine, and many doctors are not staffed properly to report all adverse effects. If you get the H1N1 vaccine or any vaccine and you experience an adverse effect, it is important to go to this website and report it. It does not take very long and you would be doing your part in helping to both develop effective vaccines and stop the spread of disease.