Health officials plan to vaccinate millions as cases of yellow fever rise during the Southern Hemisphere rainy season.

São Paulo closed its zoo and botanical gardens Tuesday as a yellow fever outbreak that has led to 70 deaths is picking up steam.

The big Inhotim art park, which attracts visitors from all over the world, also announced that all visitors would have to show proof of vaccination to be allowed in. The park said the measure was preventative and no case of yellow fever had been found there. Continue reading.