The Ministry of National Health recommends that Argentina travel to one of the twenty Brazilian states (Rorama, Amapá, Amazonas, Pará, Acre, Rondónia, Mato Grosso, Mato Grosso Do Sul, Maranhão, Tocantins, Goiás, Sáo Paulo, Paraná, Santa Catarina, Rio Grande Do Sul, Piaui (West and South), Bahia, Minas Gerais, Espíritu Santo and Rio de Janeiro) who were vaccinated against yellow fever at least 20 days before leaving.
This recommendation resulted in an unusual increase in the demand for this dose of vaccine in Buenos Aires vaccination in the past few days. At Misiones, although there was an increase in demand for the yellow fever vaccine, it was not significant. One reason is that 96% of the province's population has been immunized against this disease. It is worth mentioning that vaccination certificates are not a requirement to enter Brazil. Even those who travel through Paraguay to or from North Brazil must accredit vaccines, at the behest of the Paraguayan authorities.
Every ten years or just once?
Before 2016, strengthening the yellow fever vaccine was recommended every ten years. However, starting in July of that year, the World Health Organization (WHO) decided that the validity period of all yellow fever vaccination certificates, including those already issued and new, must last from 10 years to 10 years. lifelong vaccinated people.
WHO offers information to tourists about the care they need to do to avoid the spread of yellow fever and other vector diseases when they visit countries at risk of transmission. (https://www.argentina.gob.ar/sites/default/files/0000001383cnt-2018-11_ith-country-list-nov-2018.pdf). For tourists over nine months who want to visit Argentina, the WHO recommends that they be vaccinated against yellow fever if their destination is the provinces of Corrientes and Misiones.
In Brazil, the area of transmission of yellow fever has spread over the past three years: it starts in the north and extends from east to south, mainly affecting the states of the west-central region. Cases registered in 2016, 2017 and 2018 exceeded reported cases in the last 50 years.