Comparative analysis of the performance of residual host cell DNA assays for viral vaccines produced in Vero cells.

Residual host cell DNA (rcDNA) from continuous cell lines used for manufacturing of biological medicinal products has been considered as safety risk. Historically, several analytical methods have been used for rcDNA quantitation including hybridization assay, Threshold assay and quantitative polymerase chain reaction (qPCR). Sanofi Pasteur has a wealth of experience in the development of methods quantifying rcDNA in vaccines.

Quantifying low-frequency revertants in oral poliovirus vaccine using next generation sequencing.

Spontaneous reversion to neurovirulence of live attenuated oral poliovirus vaccine (OPV) serotype 3 (chiefly involving the n.472U>C mutation), must be monitored during production to ensure vaccine safety and consistency. Mutant analysis by polymerase chain reaction and restriction enzyme cleavage (MAPREC) has long been endorsed by the World Health Organization as the preferred in vitro test for this purpose; however, it requires radiolabeling, which is no longer supported by many laboratories.