The World Health Organization (WHO) has set up an emergency response team to address the outbreak of the Zika virus, the mosquito-borne infection that has been linked to severe birth defects and is spreading across the Americas with “explosive” speed.
Zika cases have now been confirmed in 23 countries and territories. WHO predicts that up to four million people will be infected this year, although most will not develop symptoms. The group’s director-general, Margaret Chan, on Monday will convene an International Health Regulations Emergency Committee in Geneva to determine whether the spread should be treated as a global emergency.
The epidemic has gone from “a mild threat to one of alarming proportions,” Chan said in a speech Thursday morning. “The level of concern is high, as is the level of uncertainty. We need to get some answers quickly.”
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The announcement comes just a week after the WHO warned that Zika is likely to spread to all countries across the Americas except for Canada and Chile. The U.S. director of National Institutes of Health (NIH) said that could eventually include regions where 60 percent of the U.S. population lives.
Since October, Brazil has seen 4,180 cases of microcephaly—a condition in which the head develops abnormally small—up from just 146 cases in 2014. Chan also said that there has been a corresponding rise in cases of Guillain-Barre syndrome, a rare and “poorly understood” autoimmune disease that can cause severe paralysis.
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