There are two types of typhoid vaccine: the injectable vaccine and the oral vaccine. The injectable vaccine is given as a single dose and provides protection for up to two years. The oral vaccine is given as four doses over the course of one week, and provides protection for up to five years.

The typhoid vaccine works by stimulating the immune system to produce antibodies that can fight off the bacteria that cause typhoid fever. The vaccine is made from either killed or weakened forms of the bacteria, which are safe and cannot cause typhoid fever.

In general, the typhoid vaccine is safe and effective. Side effects are usually mild and may include pain, redness or swelling at the injection site, or a mild fever. The oral vaccine may cause some gastrointestinal side effects such as nausea, vomiting, or diarrhea.

It is important to note that the typhoid vaccine is not 100% effective and does not provide protection against all strains of the bacteria that cause typhoid fever. In addition to getting vaccinated, it is also important to practice good hygiene, such as washing your hands frequently, drinking only bottled or boiled water, and avoiding raw or undercooked food.