Does indoor spraying help prevent dengue?

The prevention of dengue, the most prevalent mosquito-borne virus in the world, relies heavily on controlling mosquito populations, as the currently available dengue vaccine is only partially effective. Indoor spraying — which involves spraying of insecticides inside houses — has the potential to be a key part of those prevention efforts, researchers report.

Prior dengue infection does not increase Zika disease severity

A study involving 65 people who live in and around São José do Rio Preto (São Paulo State, Brazil), where dengue is endemic and there was a particularly rapid outbreak of Zika during the 2016 epidemic, show that prior dengue infection in human beings infected by Zika does not necessarily lead to a worse illness.