But he says that it could leave residents of cities densely populated as rio de Janeiro and Sao Paulo at risk if it spreads.
Although the risk is still remote, it is only a year after the epidemic ofdramatic Zika in the country, which later spread to various parts of the world.
The outbreak of yellow fever continues until now has been limited torural areas, where it is primarily spread to humans by two rural species of mosquito monkeys unlikely infected, according to Brazilian health officials.
But there are growing concerns probably could start spreading in a cycle of humans to humans by the mosquito Aedes aegypti.
This mosquito, common in many tropical and subtropical cities, alsocarries the dengue and the Zika virus, which has been linked to thousands of babies who are born with underdeveloped brains.
On an assessment of risk of 2013-17, who advised travelers to get shots if they were visiting in all but eight Brazilian States - six in the Northeast, along with the Espirito Santo and Rio de Janeiro.
The who list now includes North of Rio de Janeiro and Espirito Santo,according to the who guidance updated this week.
Ministry of health of Brazil said Tuesday that since December, when first detected outbreak of yellow fever, were 127 confirmed deaths, with another 106 under investigation.
A total of 1,500 suspected cases of yellow fever they have been confirmed 371, 966 are still being examined and the rest discarded.
The number of suspected cases and confirmed is higher since the year 2000 Brazil is worrying.
Vaccination against yellow fever fell in southeastern Brazil in recent decades because the virus had largely been eradicated from the region.
Now, however, the Ministry of health is rushing to vaccinate people,sending nearly 15 million doses extras to the newly affected areas.
A viral disease found in tropical Africa and the Americas, yellow fevermainly affects humans and monkeys.
It is usually asymptomatic or mild in humans, but it is deadly to monkeys.
A sharp rise in the number of monkeys killed in Southeast of Brazil raised for the first time the virus is spreading, especially since some cases confirmed in monkeys occurred near Belo Horizonte and Vitoria'salarm.
It is not clear what caused the outbreak.
Brazil health officials are investigating whether it is related to a dam collapse by 2015 in an iron ore mine.
The accident worst Brazil environmental catastrophe ever, could havedisrupted the habitat of monkeys, and food supplies.
WHAT IS YELLOW FEVER?
Yellow fever is a serious viral infection transmitted by certain types ofmosquitoes.
It is found primarily in sub-Saharan Africa, parts of the Caribbean andSouth America.
Symptoms occur in two stages. The initial symptoms develop three to six days after infection and include: high temperature, vomiting and muscle pain.
Most people make a recovery complete with a couple of days, but 15% will go to develop more serious problems, including jaundice, renal failure, and bleeding from the mouth.
Up to half of these people will die.
JUMP IN MOTHERS OF ZIKA-BEATING, BIRTH DEFECTS STUDY FINDS
Pregnant women infected with the virus Zika last year were 20 timesmore likely to have children with birth defects that those who gave birth before the epidemic, the United States health officials said earlierthis month.
Researchers from the Centers for Control and prevention comparedwith the results of birth before the outbreak of the epidemic of Zika in 2015 - with three records of State of United States - of the mothersinfected with the virus in the year 2016.
The defects include microcephaly - paralyzing deformation which leads to babies who have very small brains and heads, as well as poor cranial development, neural tube defects and other abnormalities of the brain or eyes.
The study found that the defects were observed in three births per 1,000 in 2013 and 2014.
But in 2016 anomalies were found in about 60 infants and fetuses per 1,000 when their pregnant mothers were infected by Zika.
Among the infected women, the virus was also responsible for 48% of miscarriages and premature births, 66 per cent with fetuses suffer frequently from neural tube defects or other abnormalities of the brainin early stages of development.
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