Zika virus cases in Brazil have diminished since emergence in 2015. We report Guillain Barré Syndrome caused by Zika and possible Chikungunya co-infection during an expected low arboviral season. This case highlights the importance of clinical vigilance for Zika in those with neurological syndromes outside typical arboviral season.
Keywords: Flavivirus; Zika vaccines; chikungunya; congenital Zika syndrome; dengue; public health emergency of international concern.