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Epidemiological update: Outbreaks of Zika virus and complications potentially linked to the Zika virus infection

07 Nov 2016

​Weekly summary

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). Since 2015, and as of 3 November 2016, there have been 70 countries and territories reporting mosquito-borne transmission of the virus. According to WHO and as of 26 October 2016, 23 countries or territories have reported microcephaly and other central nervous system (CNS) malformations in newborns potentially associated with Zika virus infection.

  • In the USA, 7 new locally-acquired cases have been reported in Florida since the last CDTR, bringing the cumulative number of locally-acquired cases to 188.
  • Bolivia and Vietnam have both confirmed the first microcephaly case potentially associated with Zika virus infection.
  • ECDC Zika map: The last reported case in Broward County, Florida, was reported on 29 July 2016. Therefore, Broward County will be represented as 'past transmission'.
  • ECDC published the ninth update of the Zika rapid risk assessment on 28 October.

Update on number of cases

USA
Five locally-acquired cases were recorded in Florida during the last week. To date, 188 locally-acquired and 776 imported cases of Zika have been reported in Florida. The distribution of the locally-acquired cases is as follows: 176 in Miami-Dade County, five in Palm Beach County, one in Pinellas County and one in Broward County. The location of exposure for the remaining cases is still under investigation.
 
EU/EEA imported cases
Since July 2015 (week 26), 20 countries (Austria, Belgium, the Czech Republic, Denmark, Finland, France, Hungary, Ireland, Italy, Luxembourg, Malta, the Netherlands, Norway, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom) have reported 1 944 travel-associated Zika virus infections through The European Surveillance System (TESSy). Over the same time period, seven EU countries reported 91 Zika cases among pregnant women.
 
Since February 2016, 12 countries have reported evidence of person-to-person transmission of Zika virus, probably via a sexual route.
 

Update on microcephaly and/or central nervous system (CNS) malformations potentially associated with Zika virus infection

 
As of 26 October 2016, microcephaly and other central nervous system (CNS) malformations associated with Zika virus infection or suggestive of congenital infection have been reported by 23 countries or territories. Brazil reports the highest number of cases. Nineteen countries and territories worldwide have reported an increased incidence of Guillain-Barré syndrome (GBS) and/or laboratory confirmation of a Zika virus infection among GBS cases.
 
 

ECDC Asessment

The spread of the Zika virus in the Americas and Asia is likely to continue as the vectors (Aedes aegypti and Aedes albopictus mosquitoes) are widely distributed there. The likelihood of travel-related cases in the EU is increasing. A detailed risk assessment was published on 28 October 2016. As neither treatment nor vaccines are available, prevention is based on personal protection measures. Pregnant women should consider postponing non-essential travel to Zika-affected areas.
 
 

Countries and territories with reported confirmed autochthonous cases of Zika virus infection in the past three months, as of 4 November 2016   

 

Countries affected in the past 3 months

Areas (non-tropical countries only)

Type of transmission

American Samoa

Widespread transmission

Anguilla

Widespread transmission

Antigua and Barbuda

Widespread transmission

Aruba

Widespread transmission

Bahamas

Widespread transmission

Barbados

Widespread transmission

Belize

Widespread transmission

Bolivia

Widespread transmission

Bonaire

Widespread transmission

Brazil

Widespread transmission

British Virgin Islands (UK)

Sporadic transmission

Cayman Islands

Widespread transmission

Colombia

Widespread transmission

Costa Rica

Widespread transmission

Cuba

Sporadic transmission

Curaçao

Widespread transmission

Dominica

Widespread transmission

Dominican Republic

Widespread transmission

Ecuador

Widespread transmission

El Salvador

Widespread transmission

Fiji

Widespread transmission

French Guiana

Widespread transmission

Grenada

Widespread transmission

Guadeloupe

Widespread transmission

Guatemala

Widespread transmission

Haiti

Widespread transmission

Honduras

Widespread transmission

Jamaica

Widespread transmission

Malaysia

Sporadic transmission

Maldives

Sporadic transmission

Martinique

Widespread transmission

Mexico

Widespread transmission

Micronesia, Federated States of

Widespread transmission

Nicaragua

Widespread transmission

Panama

Widespread transmission

Paraguay

Widespread transmission

Peru

Widespread transmission

Philippines

Widespread transmission

Puerto Rico

Widespread transmission

Saba

Sporadic transmission

Saint Kitts and Nevis

Widespread transmission

Saint Lucia

Widespread transmission

Saint Martin

Widespread transmission

Saint-Barthélemy

Widespread transmission

​Saint Vincent and the Grenadines

​Widespread transmission

Singapore

Widespread transmission

Sint Eustatius

Widespread transmission

Sint Maarten

Widespread transmission

​Solomon Islands

​Sporadic transmission

Suriname

Widespread transmission

Thailand

Widespread transmission

Trinidad and Tobago

Widespread transmission

United States of America

Miami-Dade

Widespread transmission

United States of America

Palm Beach

Sporadic transmission

US Virgin Islands

Widespread transmission

Venezuela

Widespread transmission

Vietnam

Widespread transmission

United States of America

Pinellas

Sporadic transmission


The classification of countries above is based on: 1) number of reported autochthonous confirmed cases; 2) number of countries who report a zika virus transmission or a country’s transmission status changes; 3) duration of the circulation.

 

Countries or territories with reported confirmed autochthonous cases of Zika virus infection in the past three months, as of 21 October 2016

 
 

All latest ECDC maps with information on countries or territories with reported confirmed autochthonous cases of Zika virus infection

 

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