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Yellow fever is a fatal mosquito-borne disease prevalent in tropical and sub-tropical Africa and South America. The causative virus is transmitted primarily by Aedes aegypti, a type of mosquitoes with widespread distribution in the world. Since December 2015, Angola started to have massive yellow fever outbreaks. Due to the close economic relationship between China and Angola, many Chinese workers and businessmen are staying in Angola. If unvaccinated, they may be infected and could bring yellow fever virus back to China when travelling home. As majority of people in China are not protected against yellow fever, the virus would spread easily in mosquito-breeding season and cause outbreaks.

The map shows 11 yellow fever cases in China imported from Luanda, capital of Angola, during 13 March to 24 April 2016. Five cases were imported to Beijing and Fuzhou respectively and one case to Shanghai. The Embassy of China in Angola had expressed that at least 6 Chinese workers in Angola were suspected to have died from yellow fever. Yellow fever is a vaccine-preventable disease. For personal and community health, people who wish to travel to endemic areas in tropical Africa and America should receive yellow fever vaccine 11 days before arrival.

Data for this map were derived from statistics from ProMED-mail.

Note: Case 6 was vaccinated before symptom onset but had probably been infected already prior to vaccination.

黃熱病是一種於熱帶及亞熱帶非洲及南美洲流行的致命蚊患，致病源是經埃及伊蚊傳播的黃熱病毒。自2015年十二月起，安哥拉爆發大型黃熱病。基於中國與安哥拉的緊密經濟合作關係，有眾多中國工人及商人居住當地。若果未曾接種疫苗，他們很有機會被感染並帶病毒回國。由於大部分中國居民對黃熱病沒有免疫力，病毒很容易於蚊季傳播，從而引致疫症爆發。

地圖顯示2016年三月十三日至四月二十四日其間十一宗中國從安哥拉首都羅安達輸入的黃熱病案例。其中北京及福州各佔五宗，上海佔一宗。中國駐安哥拉領事館早前亦公佈有六宗中國工人死亡個案懷疑是由黃熱病引致。黃熱病是可以以疫苗預防。為了個人及社區健康，任何有意前往熱帶非洲及美洲疫區的旅客應於出發前十一天接種疫苗。

地圖資料源自ProMED-mail。

註：個案6於發病前曾接受疫苗注射，但相信在注射前已受到感染。