Emergencies

Zika situation report

18 August 2016

Zika virus, Microcephaly and Guillain-Barré syndrome

Key updates

  • Countries and territories reporting mosquito-borne Zika virus infections for the first time:
    • Bahamas
  • Countries and territories reporting microcephaly and other central nervous system (CNS) malformations potentially associated with Zika virus infection for the first time:
    • Honduras and Suriname
  • Countries and territories reporting Guillain-Barré syndrome (GBS) cases associated with Zika virus infection for the first time:
    • Costa Rica and Guatemala
  • Operational measures from the WHO Eastern Mediterranean Region:
    • WHO will conduct Zika risk assessment missions including to Somalia
    • WHO is planning a training workshop on Incident Command System with partners in addition to a workshop to develop surveillance strategy and guidance for detection of Zika and other arboviral diseases, both for November 2016.
    • WHO is rolling out three training workshops on prevention and control of Aedes mosquitos for national entomologists from August to October

Summary

  • 70 countries and territories have reported evidence of mosquito-borne Zika virus transmission since 2007 (67 since 2015):
    • 53 with a first reported outbreak from 2015 onward.
    • 4 with having possible endemic transmission or evidence of local mosquito-borne Zika infections in 2016.
    • 13 with evidence of local mosquito-borne Zika infections in or before 2015, but without documentation of cases in 2016, or with the outbreak terminated.
  • 17 countries or territories have reported microcephaly and other CNS malformations potentially associated with Zika virus infection or suggestive of congenital infection. 4 of the 17 countries reported microcephalic babies born from mothers in countries with no endemic Zika virus transmission but who reported recent travel history to Zika affected countries.
  • Outcomes of pregnancies with laboratory evidence of possible Zika virus in the United States of America:
    • 16 total liveborn infants with birth defects (one newly reported)
    • 5 total pregnancy losses with birth defects
  • Outcomes of pregnancies with laboratory evidence of possible Zika virus in territories of the United States of America:
    • 1 total liveborn infant with birth defects
    • 1 total pregnancy loss with birth defects
  • 18 countries and territories have reported an increased incidence of GBS and/or laboratory confirmation of a Zika virus infection among GBS cases.
  • Guinea-Bissau:
    • 7 new cases were found to be positive for Zika. The samples have been sent to Institute Pasteur Dakar (IPD) in Senegal for further testing. A total of 154 samples were collected from the Bijagosislands by the recent mission by staff from the WHO Regional Office for Africa and regional partners. During this mission 401 lots of mosquitos were collected and four of them were positive for Zika. Of the mosquitoes collected, 80% were Aedes egypti and Aedes luteocephalus which indicates that the risk index is high.
    • 5 cases of microcephaly have been reported since April 2016. Three cases were reported from Oio and 2 cases from Gabu. Investigations of these cases are ongoing.
    • The gene sequencing results of the 4 confirmed Zika cases sent on 1 July are still pending.
    • Following the joint mission, additional WHO deployments of entomologists, epidemiologists and laboratory experts are being pursued.

This page links all WHO information to its response on the Public Health Emergency of International Concern.