Meningoencephalitis: Rare manifestation of Dengue haemorrhagic fever

Dengue is a common tropical disease occurring in Sri Lanka. Neurological manifestations due to dengue are very rare but can be caused by serotypes 2 and 3. Here we present a patient with meningoencephalitis occurring as a manifestation of dengue haemorrhagic fever (DHF) in a young boy who presented with fever, constitutional symptoms and a seizure. Diagnosis was confirmed by NS1 positivity and the presence of dengue specific IgM in the CSF with characteristic electroencephalographic findings. He was treated according to the dengue local national guidelines and had complete recovery without residual neurological deficits.