The number of cases of microcephaly in Brazil associated with the Zika virus has risen to 4,863—up from 4,690 a week ago.
Confirmed cases of the virus reached 641, while suspected cases now total 4,222, Reuters reported on Wednesday morning, citing the Ministry of Health.
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The Zika epidemic—which is now spreading through the Americas and prompting a dedicated response from the U.S. Centers for Disease Control and Prevention—is centered in Brazil.
Read more: How Brazil Uncovered the Possible Connection Between Zika and Microcephaly
Doctors believe the virus is linked to microcephaly, a birth defect involving an abnormally small head and incomplete brain development, though there is not yet definitive scientific proof of the link.
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