Brazilian officials have said the Zika virus has been linked to a large number of cases of microcephaly, a rare birth defect, and the number of reports has risen to 3,893 since authorities began investigating the surge in cases in October. The country will mobilize some 220,000 troops to battle the mosquito blamed for spreading the virus. Inspectors have already started to spray insecticide around Sambadrome, the outdoor grounds where thousands of dancers and musicians will parade during the city's Feb. 5-10 Carnival celebrations and where the archery competitions will take place during the Rio Olympics.
Estafany Perreira holds her nephew David Henrique Ferreira, 5 months, who has microcephaly, in Recife, Brazil.
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