On April 16, Dynavax Technologies (DVAX) and Sinovac Biotech (SVA) announced a collaboration to develop a vaccine to prevent COVID-19. This morning, Sky News reported that scientists working on a COVID-19 vaccine at the Chinese biotech company have said they are “99%” sure it will be effective. In early Friday morning trading, Dynavax shares are up $1.27, or 26%, to $6.11.