In some cases, getting dengue may protect against Zika
What happened in a hard-hit Brazilian slum suggests timing of dengue infections may matter
![Pau da Lima neighborhood](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/02/020619_TS_zika_feat.jpg?fit=860%2C460&ssl=1)
EPIDEMIC EPICENTER The Pau da Lima neighborhood (pictured) in Salvador, Brazil, was hit hard by the Zika outbreak in 2015 and 2016. A long-running health study in the neighborhood found some surprising lessons about the how the virus spread.
Albert Ko