Dengue fever (DF) is endemic in India and Singapore, and also causes frequent epidemics. Dengue virus belongs to the Flavivirus genus of the family Flaviviridae and its members include the 4 antigenically related serotypes of dengue virus (DENV 1–4). He also had metastatic squamous cell lung carcinoma and last received carboplatin, paclitaxel and a second cycle of pembrolizumab a month before presenting. His blood pressure was
115/55mmHg, pulse rate was 38 beats/min and oxygen saturation was 96% on room air. He was afebrile.
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