The Ministry of Health of the Nation has recommended that Argentines travel to any of these twenty Brazilian states (Rorama, Amapa, Amazonas, Para, Acre, Rondonia, Mato Grosso, Mato Grosso Do Sul, Maranhao, Tocantins, Goias, Sao Paulo, Parana, Santa Catarina , Rio Grande Do Sul, Piaui (West and South), Bahia, Minas Gerais, Espiritu Santo and Rio de Janeiro) who have been vaccinated against yellow fever at least 20 days before departure.
This recommendation has produced an unusual increase in demand for the doses of these vaccines in Buenos Aires vaccination in recent days. In Misiones, although there was an increase in demand for a yellow fever vaccine, it was not so significant. One of the reasons is that 96% of the province's population has already been immunized against this disease. It is worth mentioning that the vaccination certificate is not a requirement for entry into Brazil. Although those who travel through Paraguay to or from the north of Brazil will have to accredit vaccines, on the orders of the Paraguayan authorities.
Every ten years or just once?
Prior to 2016, yellow fever vaccination is 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, should go from 10 years of the whole life of the vaccinated person.
The WHO provides tourists with information on the care they need to take to avoid the spread of yellow fever and other vector diseases when visiting countries with a risk of transmission (https: //vv.argentina.gob.ar/sites/default/files/0000001383cnt-2018-11_ith-countri-list-nov-2018.pdf). For tourists over nine months who want to visit Argentina, VHO recommends vaccine against yellow fever if their destination is the province of Corrientes and Misiones.
In Brazil, the spread of yellow fever spread over the last three years: it began in the north and spread from east to south, affecting mainly the countries of the Central-Western region. Cases registered in 2016, 2017, and 2018 exceeded reported cases in the last 50 years.