There were no new cases of Yellow Fever reported in Brazil last month, a change from earlier this year when the country reported more than 700 cases, including those near big cities like Rio De Janeiro and Sao Paulo.

But scientists still fear a resurgence, especially as Brazil enters its summer months.

Here & Now‘s Meghna Chakrabarti speaks with writer Sam Kean (@sam_kean) who followed the trail of yellow fever and the push to prevent outbreak for Science magazine.

