The Ministry of Health of the nation recommended that Argentina travel to each of these 20 Brazilian states (Rorama, Amapá, Amazonas, Pará, Acre, Rondónia, Mato Grosso, Mato Grosso Do Sul, Maranhão, Tocantins, Goiás, São Paulo, Caterina, Rio Grande do Sul, Piaui (West and South), Bahia, Minas Gerais, Espíritu Santo and Rio de Janeiro) that are vaccinated against yellow fever at least 20 days before departure.
This recommendation has led to an exceptional increase in the demand for doses of these vaccines in Buenos Aires vaccines in recent days. For Missions, although there was an increase in demand for yellow fever vaccine, it was not significant. One reason for this is that 96% of the county population has been immune to this disease. It should be mentioned that the vaccination certificate is not a requirement to enter Brazil. Although those traveling through Paraguay to or from northern Brazil will have to authorize the vaccinations, in the order of the Paraguayan authorities.
Every ten years or just once?
Before 2016, it is recommended to strengthen yellow fever vaccine every ten years. However, starting in July of that year, the World Health Organization (WHO) decided that the period of validity of all yellow fever vaccination certificates, including those already issued and new, should exceed 10 years for the entire life of the immunized person.
The World Health Organization offers tourist information on the treatment they need to take to prevent the spread of yellow fever and other vector diseases when they visit countries with a 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 World Health Organization recommends vaccinating them against yellow fever if their destination is the counties of Corinths and Mission.
The epidemiological situation
In Brazil, an area of yellow fever has expanded over the last three years: it began in the north and expanded from east to south, affecting mostly central-western countries. Cases recorded in 2016, 2017, and 2018 exceeded those reported in the last 50 years.