Intravenous immunoglobulin (1 g/kg) was infused at days 22 and 23 without improvement. Fever and respiratory symptoms appeared secondarily at day 25, 4 days after the onset of neurological symptoms, with productive cough and fever up to 40°C. CRP remained normal. Chest computerized tomography scan showed images characteristic of pulmonary COVID‐19. SARS‐CoV‐2 reverse transcriptase‐PCR assay was positive in nasopharyngeal swab and blood, not in CSF. No replication of EBV, HSV, CMV, or adenovirus could be documented. Acute respiratory distress syndrome led to transfer to an intensive care unit at day 29.