Yellow fever situation report

21 October 2016

A yellow fever outbreak was detected in Luanda, Angola late in December 2015. The first cases were confirmed by the National Institute for Communicable Diseases (NICD) in South Africa on 19 January 2016 and by the Institut Pasteur Dakar (IP-D) on 20 January. Subsequently, a rapid increase in the number of cases has been observed.

Key updates

Angola epidemiological update (as of 13 October):

  • The last confirmed case had symptom onset on 23 June.
  • 45 probable cases were reported in the last 4 weeks
  • Phase II of the vaccination campaign is ongoing, targeting more than 2 million people in 10 provinces.

Democratic Republic of the Congo epidemiological update (as of 19 October):

  • The last confirmed non-sylvatic case had symptom onset on 12 July.
  • 16 probable cases remain under investigation (4 in Kinshasa, 8 in Kwango, and 1 case each in Bas Uele, Kwilu, Lualaba and Sud Ubangi provinces).
  • The reactive vaccination campaign in Feshi Health Zone in Kwango province concluded after 152 492 people were vaccinated. The reactive campaign in Mushenge Health Zone in Kasai province began on 20 October.


  • The continuing detection and investigation of probable cases (including the 45 probable cases in Angola) demonstrate that active surveillance is ongoing. Nevertheless, it is important to note persistent difficulties in surveillance and laboratory confirmation capacities, which may delay case detection. A strong and sustained surveillance effort remains crucial.
  • The status of the probable cases in Angola will be reviewed by the Ministry of Health’s Final Classification Committee once the investigations are completed on their exposure history and yellow fever vaccination status.

This page links all WHO technical and general information on yellow fever.

Information in Portuguese

This page links all WHO technical and general information on yellow fever in Portuguese