During the acute febrile phase, Lujo virus was isolated from blood from days 2 to 13 after onset. Virus was also isolated from liver tissue obtained post-mortem. A subsequent complete genomic analysis of Lujo virus facilitated the development of specific molecular detection (RT-PCR) assays.
Serologic diagnosis of Lujo hemorrhagic fever can be made by indirect immunofluorescent assay and ELISA. However, individuals from endemic areas displaying fever, rash, pharyngitis, accompanied by laboratory findings of low platelet counts and elevated liver enzymes, should be suspected of having a hemorrhagic fever virus infection. Clinical specimens should be tested using specific assays.