Brazil declares yellow fever emergency.  According to BBC NEWS and CNN NEWS, At least 15 people have died cause of yellow fever since December.  Some states in Brazil run out vaccines because of outbreak.

Yellow fever is transmitted to human by mosquitoes.  Fever, muscle and back pain, headache, shivers, loss of appetite, and nausea or vomiting show as symptoms of yellow fever, but it is difficult to diagnosed and often confused with other diseases such as fever.  If people are in toxic phase of yellow fever, half of people who are in the phase died within 10 to 14 days. The WHO advised travelers who have plan to go to Brazil especially Sao Paulo to get vaccination at least 10 days before traveling.

In the case of United States, US Embassy and Center for Disease Control and Prevention issued health alert not only Sao Paulo but also Rio de Janeiro and Brazilian States of Santo and Bahia.

For protecting from Yellow fever, wearing long sleeve shirt and pants and using an insect repellent are recommended.

For more information, please check web sites below.

 参考文献

BBC NEWS

http://www.bbc.com/news/world-latin-america-42763471

CNN NEWS

https://edition.cnn.com/2018/01/25/health/brazil-yellow-fever-outbreak/index.html

厚生労働省検疫所（FORTH）

http://www.forth.go.jp/topics/2018/01241443.html

外務省海外安全ホームページ（MOFA）

http://www.anzen.mofa.go.jp/info/pcspotinfo_2018C007.html