Brazil is recognized worldwide for its National Immunization Program (PNI), which offers all vaccines recommended by the World Health Organization (WHO) in the public health network. With a major public health effort and years of campaigns to massify the importance of vaccination, the country became free of diseases such as urban yellow fever, smallpox, poliomyelitis, rubella and measles.

But the circulation of fake news has contributed to jeopardize the success of this historical record and brought back some of these diseases that many thought were a thing of the past. In today’s information age, truth and lies fight for the same spaces in the imaginary of the public opinion and the connectivity of modern life is a catalyst for the dissemination of fake news. This behavior, so striking in the contemporary world, when applied in the area of health can directly interfere in the well-being of the population and even cause deaths. In the case of vaccination, the rumors turn into public health problems and directly affect the drop in vaccine coverage. And this issue can be seen with the outbreak of outbreaks in recent years of diseases such as yellow fever and measles.