Major criteria

Abnormal bleeding Swollen neck or face Conjunctivitis or sub-conjunctival haemorrhage Spontaneous abortion Unexplained tinnitus or altered hearing during a febrile illness Persistent low systolic blood pressure Known exposure to a suspect, probable or confirmed patient with Lassa fever or participated in funeral practices in the last 21 days Readmitted within three weeks of inpatient care for illness with fever Markedly elevated aspartate aminotransferase (AST)/alanine aminotransferase (ALT) Positive coagulation test

Minor criteria

Headache Sore throat Persistent vomiting Diffuse abdominal pain/tenderness Retro-sternal pain Diarrhoea Generalized myalgia and arthralgia Profuse weakness Proteinuria WBC count <4000 μL