Dynavax (DVAX) Gains as Medigen Rolls Out COVID-19 Vaccine Posted byZacks Equity Research August 24, 2021 Leave a comment on Dynavax (DVAX) Gains as Medigen Rolls Out COVID-19 Vaccine Dynavax (DVAX) stock gains as partner Medigen announces launch of its COVID-19 vaccine MVC-COV1901 adjuvanted with CpG 1018 of the former.