Guilherme Soares Amorim, 2 months, who was born with microcephaly, is pictured in his house in Ipojuca...
Guilherme Soares Amorim, 2 months, who was born with microcephaly, is pictured in his house in Ipojuca, Brazil, February 1, 2016. Brazil's top health official said on Monday that the Zika virus outbreak is proving to be worse than believed because most cases show no symptoms, but improved testing should allow the country to get a better grip on the burgeoning public health crisis. REUTERS/Ueslei Marcelino