There is an outbreak of Yellow fever in Angola.
Vaccines will probably cut the spread.
from outbreak news:
they are planning to give the yellow fever vaccine to everyone in the capital (7 million plus people). And the article mentions the logistical problems.
A local who flew back to China after being there is being treated in a Shanghai hospital.
I guess we'll have to go back to the old days, when you carried a yellow booklet proving you had received yellow fever, small pox and cholera vaccines before they let you into some countries.