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São Paulo initiates fractionated dose vaccination against Yellow Fever
From the next month, the government of São Paulo will apply fractional doses of vaccine against yellow fever. The measure, which will also be adopted by Rio de Janeiro and Bahia, was taken after confirming that the transmitting virus spreads and threatens areas that until then were considered free of the disease, such as the north coast of São Paulo. "There are records of infected monkeys in the Serra do Mar. It is possible that in the not-so-distant future we will have Yellow Fever reaching the coast of São Paulo," said Marcos Boulos, coordinator of Disease Control at the Health Secretariat of the State of São Paulo. campaign with the fractional vaccine will be carried out at the beginning and end of February in São Paulo. Already in Bahia, it is intended to carry out the vaccination only at the end of next month, due to the Carnival. In spite of the new initiative, the total dose will continue for specific cases, such as for people going to forest areas and for countries requiring a yellow fever vaccination certificate.
According to the World Health Organization (WHO), the vaccine applied today lasts a lifetime, while the fractioned one will be valid for nine years. The new rule, already used in countries such as Angola, was highlighted after analysis by the National Immunization Commission, which determined the duration of the vaccine.
Initially, it was estimated that protection of the fractioned dose would be only one year, but there was a follow up with the people who received it and the result was satisfactory. "These people are still under evaluation, it is possible that in the future it will be seen that the term of protection is even greater than the nine years now found," said Marcos Boulos.
Only in 2017, from July to December, cases in humans and one death. Therefore, the objective of the campaign is to vaccinate the largest number of people, since in São Paulo 69% of the municipalities did not reach the goal of vaccinating 95% of the population.
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