Will there be side effects?

Vaccines are usually effective and safe, but reactions can sometimes occur. Reactions can be restricted to the site of injection or more general, affecting the whole body. Most reactions occur within a day or two of the vaccine, settle spontaneously, and are a sign of a strong immune response. Live vaccines, such as measles, chicken pox, one of the Japanese encephalitis needles and yellow fever can cause a more delayed response, usually 4-5 days and sometimes longer, after vaccination. Almost all reactions are self-limiting. They settle spontaneously without long term problems.

Anaphylaxis is a very rare severe allergic reaction which does require treatment and usually occurs within half an hour of the vaccine. Serious reactions are extremely rare.