Clinical research for the Brazilian National Immunization Program.

The Brazilian National Immunization Program (PNI, acronym in Portuguese) was created in 1973 with the aim of coordinating the country’s immunization activities. Brazil is a country of continental dimensions, with a well-characterized geographic diversity and dry land borders on several other countries of South America, making it more vulnerable to epidemics, which can reach the country and spread quickly. This makes a strong PNI extremely important for the country’s states and municipalities, capable of achieving and sustaining high and homogenous vaccination coverage rates.