Brazil says Zika virus outbreak worse than believed

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.

Health Minister Marcelo Castro told Reuters that Brazil will start mandatory reporting of cases by local governments next week when most states will have labs equipped to test for Zika, the mosquito-borne virus that has quickly spread through Latin America. The virus has no vaccine or cure at present.