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Diagnostics for Lassa Fever: Detecting Host Antibody Responses.
There are two types of viral diagnostics: (1) those that detect components of the pathogen (like viral RNA or proteins) and (2) those that detect host molecules that rise or fall as a consequence of pathogen infection (like anti-viral antibodies or virus-induced inflammatory cytokines). Quantitative PCR to detect Lassa RNA, and clinical chemistry to detect high liver enzymes (AST/ALT) are commonly used to diagnose Lassa fever. Here, we discuss the various types of diagnostics for Lassa fever and the urgent need for early diagnosis. We also describe a protocol for using the attenuated Lassa vaccine candidate, ML29 , as an antigen for detecting Lassa-specific antibodies. Since antibodies are developed late in the progression of Lassa fever disease, this is not an early diagnostic, but is more useful in surveillance of the population to determine the sero-prevalence of antibodies to Lassa virus (LASV ), and to define treatment options for people in close contact with a Lassa-infected person.
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