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Digital PCR to quantify ChAdOx1 nCoV-19 copies in blood and tissues


ABSTRACT: Vaccination with the adenoviral-vector-based AstraZeneca ChAdOx1 nCov-19 (Vaxzevria) vaccine is efficient and safe. However, in rare cases vaccinated individuals developed life-threatening thrombotic complications, including thrombosis in cerebral sinus and splanchnic veins. Monitoring of the applied vector in vivo represents an important precondition to study the molecular mechanisms underlying vaccine-driven adverse effects now referred to as vaccine-induced immune thrombotic thrombocytopenia (VITT). We previously have shown that digital PCR (dPCR) is an excellent tool to quantify transgene copies in vivo. Here, we present a highly sensitive dPCR for in situ quantification of ChAdOx1 nCoV-19 copies. Using this method, we quantified vector copies in human plasma 24, 72, and 168 h post vaccination and in a variety of murine tissues in an experimental vaccination model 30 min post injection. We describe a method for high-sensitivity quantitative detection of ChAdOx1 nCoV-19 with possible implications to elucidate the mechanisms of severe ChAdOx1 nCov-19 vaccine complications. Graphical abstract Badbaran et al. introduce a digital PCR technique for quantification of ChAdOx1 nCov-19 vaccine vector copies. Based on its excellent specificity and sensitivity, the new assay facilitates ChAdOx1 nCov-19 monitoring in different biological specimens and might thus help to elucidate the mechanisms underlying the rare but potentially severe vaccine-caused complications.

SUBMITTER: Badbaran A 

PROVIDER: S-EPMC8566940 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2024-07-18 | GSE244965 | GEO