Communicable disease threats report, 19-25 June 2016, week 25

Surveillance report
Publication series: Communicable Disease Threats Report (CDTR)
Time period covered: 19 - 25 June 2016

​The ECDC Communicable Disease Threats Report (CDTR) is a weekly bulletin for epidemiologists and health professionals on active public health threats. This issue covers the period 19-25 June 2016 and includes updates on poliomyelitis, public health risks associated with refugee movements, Zika virus, yellow fever and West Nile fever.

Executive summary

West Nile virus - multistate

Between the months of June and November, corresponding to the transmission season of the virus, ECDC monitors the situation in EU Member States and neighbouring countries. This information updates blood safety authorities of WNF-affected areas and identifies significant changes in the epidemiology of the disease.
 
As of 23 June, no human cases of West Nile fever have been reported in the EU. Six cases were reported by neighbouring countries, namely Israel.
 
Read more about the West Nile fever.See the weekly West Nile fever maps.

Zika virus infection

Since 1 February 2016, Zika virus infection and the related clusters of microcephaly cases and other neurological disorders constitute a public health emergency of international concern (PHEIC). There is now a scientific consensus that Zika virus is a cause of microcephaly and Guillain-Barré syndrome.
 
During the past nine months, 53 countries and territories have reported autochthonous cases of Zika virus infection. This week, the island of Anguilla reported its first sporadic autochthonous case of Zika virus infection. Ten countries have reported evidence of person-to-person transmission of Zika virus, probably via a sexual route.
 

 
Yellow fever outbreak – Africa

An outbreak of yellow fever in Angola (3 294 suspected cases as of 17 June) started in December 2015 in the municipality of Viana, Luanda province, and spread to all the 18 provinces of Angola.
 
The neighbouring Democratic Republic of Congo (DRC) officially declared on 20 June a yellow fever outbreak (1 106 suspected cases) linked to the one in Angola.
 
Peru has been experiencing an outbreak of yellow fever since the beginning of the year, with 56 suspected cases including four deaths (as of 16 June 2016).
 
Other countries (Brazil, Chad, Colombia, Ghana, Republic of Congo and Uganda) are currently reporting yellow fever outbreaks or sporadic cases not linked to the outbreak in Angola.
 
In Ethiopia all the 22 suspected yellow fever cases reported earlier from South Omo zone tested negative for yellow fever.
Yellow fever cases in people who travelled from Angola have been reported in China (11 cases), Democratic Republic of the Congo (51 confirmed cases) and Kenya (two cases).
 
WHO announced on 17 June that the Strategic Advisory Group of Experts (SAGE) on immunisation reviewed evidence that using one fifth of a standard dose protects against yellow fever for at least 12 months and possibly longer. WHO and partners are considering the use of this dose-sparing strategy to prevent transmission through a large-scale vaccination campaign.