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• W2912142332 abstract "Zika virus (ZIKV) is a mosquito-borne flavivirus posing a public health threat due to its association with neurological complications in newborns and adults. In flavivirus-endemic areas, coming mosquito seasons will require the differentiation of primary versus secondary and acute versus past ZIKV/flavivirus infections. This is complicated by two major difficulties: [i] secondary infections often present with low or undetectable titres of specific IgM and with early-positive IgG, [ii] previous flavivirus infection(s) or vaccinations cause elevated cross-reactivities. Here, we analysed the anti-ZIKV IgA, IgG, and IgM responses at different stages of infection in an endemic setting, scrutinising the diagnostic relevance of specific IgA. Anti-ZIKV antibodies were measured by ELISA based on ZIKV non-structural protein 1 (NS1) in paired sera from 31 patients with suspected primary or (flavivirus-primed) secondary ZIKV infection. The control panel comprised samples from 136 DENV-infected patients. Among ZIKV samples collected 8–16 days after symptom onset, ELISA sensitivities for detecting anti-ZIKV NS1 IgA, IgG, and IgM were 93.5%, 100%, and 48.4%, respectively. The proportion of cases with negative IgM but positive IgA was higher in suspected secondary (61.9%) than in primary (30.0%) ZIKV infections. Combined IgA/IgM detection yielded a sensitivity of 100% at a specificity of 97.1%. In conclusion, at time points after PCR can detect the virus, the determination of anti-ZIKV NS1 IgA may improve the accuracy in diagnosing acute ZIKV infection in flavivirus-endemic regions in the context of both primary and secondary infection, especially when IgM is undetectable." @default.
• W2912142332 created "2019-02-21" @default.
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• W2912142332 date "2019-05-01" @default.
• W2912142332 modified "2023-09-26" @default.
• W2912142332 title "Added value of IgA antibodies against Zika virus non-structural protein 1 in the diagnosis of acute Zika virus infections" @default.
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• W2912142332 doi "https://doi.org/10.1016/j.jviromet.2019.02.005" @default.
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