Vaccination schedule ( timing of all doses consists)  consists of thirteen vaccinations.
A vaccination schedule is a series of vaccinations, including the timing of all doses, which may be either recommended or compulsory, depending on the country of residence. Many vaccines require multiple doses for maximum effectiveness, either to produce sufficient initial immune response or to boost response that fades over time. In 2009, the U.S. Centers for Disease Control and Prevention (CDC) recommended vaccination against at least fourteen diseases. By two years of age, U.S. children receive as many as 24 vaccine injections, and might receive up to five shots during one visit to the doctor. 
