A committee convened by Chan officially declared Zika a public health emergency of worldwide concern February 1, indicating that the disease constitutes an global public health risk and requires a coordinated response. Sources say that there have only been 7,900 reported cases between January and April of this year, as opposed to the 170,500 cases reported during the same period in 2016. The virus is to blame for a birth defect that causes a baby's head to be smaller than normal because the brain doesn't develop properly and children end up with smaller heads than normal.
The Zika virus emergency fell upon Brazil when the country was preparing to host the 2016 Olympics, fuelling the concerns that Rio Olympics could spread the virus.
The World Health Organization (WHO) lifted its own global emergency in November, even while saying the virus remained a threat. And after it was declared a national emergency in Brazil, it was pretty much across every single newspaper front page.
"The end of the emergency doesn't mean the end of surveillance or assistance" to affected families, said Adeilson Cavalcante, the secretary for surveillance at Brazil's health ministry.
Zika wasn't connected as the cause of microcephaly until 2015, when the government recognized the virus as a full-on epidemic.
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Photos of babies with the defect spread panic around the Western Hemisphere and the globe, as the virus was reported in dozens of countries.
State health officials warned New Yorkers on Friday to take precautions against Zika virus and other mosquito-borne illnesses like West Nile virus, as the weather heats up.
In response to the outbreak, Brazil launched a campaign targeted at eradicating mosquitos in the country.
Those infected typically suffer mild flu-like symptoms. Those efforts have resulted in a dramatic decline of Zika cases.
All three diseases are carried by the Aedes aegypti mosquito.