Situation Report Yellow Fever, 28 July 2016
In Angola, as of 21 July 2016 a total of 3748 suspected cases have been reported, of which 879 are confirmed. The total number of reported deaths is 364, of which 119 were reported among confirmed cases. Suspected cases have been reported in all 18 provinces and confirmed cases have been reported in 16 of 18 provinces and 80 of 125 reporting districts.
Mass reactive vaccination campaigns first began in Luanda and have now expanded to cover most of the other affected parts of Angola. Recently, the campaigns have focused on border areas. All districts continued with house to house immunization campaigns and routine vaccination.
The recent technical difficulties at the national laboratory in the Democratic Republic of The Congo (DRC) have been resolved and the laboratory confirmation of yellow fever cases in DRC has resumed. According to the preliminary results of tests performed on a backlog samples, seven new patients have tested positive for yellow fever. Additional investigations to determine the definitive status of these cases are ongoing. Until these investigations are completed, the official case count in DRC remains unchanged.
According to the latest confirmed information, DRC has reported 1907 suspected cases (as of 20 July) and 68 confirmed cases (as of 24 June) including 95 reported deaths. Cases have been reported in 22 health zones in five of 26 provinces. Of the 68 confirmed cases, 59 were imported from Angola, two are sylvatic (not related to the outbreak) and seven are autochthonous.
In DRC, surveillance efforts have increased and vaccination campaigns have centred on affected health zones in Kinshasa and Kongo Central and Kwango. Reactive vaccination campaigns started on 20 July in Kisenso health zone in Kinshasa province and in Kahemba, Kajiji and Kisandji health zones in Kwango province.
Seven countries (Brazil, Chad, Colombia, Ghana, Guinea, Peru and Uganda) have reported yellow fever outbreaks or sporadic cases not linked to the Angolan outbreak.
An Emergency Committee (EC) was convened on 19 May 2016. The WHO DirectorGeneral accepted the EC’s assessment that the urban yellow fever outbreaks in Angola and DRC are serious public health events which warrant intensified national action and enhanced international support. The situation does not currently constitute a Public Health Emergency of International Concern.
WHO Strategic Advisory Group of Experts (SAGE) on Immunization reviewed existing evidence that demonstrates that using a fifth of a standard vaccine dose would still provide protection against the disease for at least 12 months and possibly longer. This approach, known as fractional dosing, will be implemented in a pre-emptive mass vaccination campaign in DRC in Kinshasa.