From Science Daily
November 14, 2018
Two new studies provide evidence that previous Dengue infection in pregnant mothers may lead to increased severity of Zika in babies, and that previous Zika infection in mice mothers may increase severity of Dengue infection in their pups. The research, publishing November 14 in the journal Cell Host & Microbe, supports that maternally-acquired antibodies for one virus can assist infection by the other by a process unique to flaviviruses.
“We’ve seen Zika infections in humans decrease from their peak in 2016, but it is still a significant concern and might re-emerge,” says senior author Mehul Suthar (@SutharLab)?, a viral immunologist at Emory University whose team studied human placental tissue to find out how Dengue antibodies help transport the Zika virus across the placental barrier. “The regions where Dengue and Zika are prevalent overlap extensively, so it’s important to understand how immune responses to one may influence vulnerability to the other.”
“There’s a prevailing attitude that antibodies are always good, but antibodies can have a range of effects,” says Sujan Shresta, an immunologist at the La Jolla Institute for Immunology whose group showed that mice born to Zika-immune mothers were more vulnerable to a deadly form of Dengue fever. “We need to embrace this complexity to develop the most effective vaccines.”