CLEAN : Zika epidemic could get worse before better: WHO chief

The transcript discusses President Dilma Rousseff's gratitude towards mothers supporting babies with microcephalus, the challenges posed by a mysterious virus, and the potential link between microcephaly and the Zika virus. It emphasizes the need for caution and continued learning as the situation evolves.

What does the speaker imply about the evidence coming from Brazil?

What is the speaker's perspective on the learning process regarding the disease?