IgG Avidity: an Important Serologic Marker for the Diagnosis of Tick-Borne Encephalitis Virus Infection
Journal Title: Polish Journal of Microbiology - Year 2016, Vol 65, Issue 1
Abstract
A total of 52 serum sles from patients with symptoms suggestive of tick-borne encephalitis virus (TBEV) infection and positive IgM and/or IgG antibodies were tested for IgG avidity. Acute/recent TBEV infection was confirmed by low/borderline avidity index (AI) in 94.8% IgM positive/IgG positive sles, while in 5.2% high AI was found indicating persisting IgM antibodies. Majority of IgM negative/IgG positive sles (78.6%) showed high AI consistent with past TBEV infection. However, in 21.3% patients without measurable IgM antibodies current/recent infection was confirmed by AI. IgG avidity represents an additional serologic marker that improves diagnosis of TBEV, especially in cases of atypical antibody response.
Authors and Affiliations
Tatjana Vilibic-Cavlek, Ljubo Barbic, Vladimir Stevanovic, Goranka Petrovic, Gordana Mlinaric-Galinovic
Keywords
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