Figure 1From: Guidance for contact tracing of cases of Lassa fever, Ebola or Marburg haemorrhagic fever on an airplane: results of a European expert consultation Risk assessment algorithm: Viral Haemorrhagic Fever (Lassa fever, Marburg or Ebola haemorrhagic fever). * If the diagnosis cannot be laboratory confirmed (e.g. if clinical samples are unavailable), contact tracing should be considered if the clinical and epidemiological picture is strongly suggestive of a VHF as the likely diagnosis.Back to article page