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

04 Nov 2016
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.

Weekly summary

  • 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

 
The 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, Netherlands, Norway, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom) have reported 1 942 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 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.

 

EU’s Outermost Regions and Territories 
 
As of 20 October 2016:
 
Martinique: 36 590 suspected cases have been reported, an increase of 65 cases during the last week. Martinique declared the Zika outbreak phase over.
French Guiana: 9 851 suspected cases have been detected, an increase of 40 cases since the previous week. According to the regional situation report, the epidemic is over.
Guadeloupe: 30 775 suspected cases have been detected, an increase of 55 suspected cases since the previous week. The weekly number of cases has been decreasing.
St Barthélemy: 820 suspected cases have been detected, an increase of 15 suspected cases since the previous week. The weekly number of cases is stable.
St Martin: 2 670 suspected cases have been detected, an increase of 70 suspected cases since the previous week. The weekly number of cases is stable.  
 
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 Assessment
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 Region Last case since 3 months
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.

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 4 November 2016

 



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

 
 
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